10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)
x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended	June 16, 2018
	OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from _________________to _________________

Commission File Number001-33987

HERITAGE-CRYSTAL CLEAN, INC.

(Exact name of registrant as specified in its charter)

Delaware	26-0351454
State or other jurisdiction of	(I.R.S. Employer
Incorporation	Identification No.)

2175 Point Boulevard

Suite 375

Elgin, IL 60123

(Address of principal executive offices)  (Zip Code)

Registrant’s telephone number, including area code: (847) 836-5670

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).   Yes x No oIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated

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filer, smaller reporting company, or an emerging growth company.  See definitions of “large accelerated filer,” “accelerated filer,” "smaller reporting company," and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer o		Accelerated filer x
Non-accelerated filer o	(Do not check if a smaller reporting company)	Smaller reporting company   o
		Emerging growth company   o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes o No x

On July 23, 2018, there were outstanding 23,048,501 shares of Common Stock, $0.01 par value, of Heritage-Crystal Clean, Inc.

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Table of Contents

PART I
ITEM 1.   FINANCIAL STATEMENTS	4
ITEM 2.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	24
ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	32
ITEM 4.   CONTROLS AND PROCEDURES	32
PART II
ITEM 1. LEGAL PROCEEDINGS	33
ITEM 6. EXHIBITS	33
SIGNATURES	34

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PART I

ITEM 1. FINANCIAL STATEMENTS

Heritage-Crystal Clean, Inc.

Condensed Consolidated Balance Sheets

(In Thousands, Except Share and Par Value Amounts)

	June 16, 2018		December 30, 2017
	(unaudited)
ASSETS
Current Assets:
Cash and cash equivalents	$	41,831	$	41,889
Accounts receivable - net	53,907		45,491
Inventory - net	26,931		21,639
Other current assets	5,040		5,895
Total Current Assets	127,709		114,914
Property, plant and equipment - net	131,555		128,119
Equipment at customers - net	23,851		23,312
Software and intangible assets - net	15,905		16,732
Goodwill	34,125		31,580
Total Assets	$	333,145	$	314,657
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts payable	$	35,166	$	25,568
Contract liabilities - net	208		—
Accrued salaries, wages, and benefits	4,181		6,386
Taxes payable	6,475		5,787
Other current liabilities	4,521		2,690
Total Current Liabilities	50,551		40,431
Long-term debt	28,884		28,744
Deferred income taxes	11,260		9,556
Total Liabilities	$	90,695	$	78,731
STOCKHOLDERS' EQUITY:
Common stock - 26,000,000 shares authorized at $0.01 par value, 23,042,972 and 22,891,674 shares issued and outstanding at June 16, 2018 and December 30, 2017, respectively	$	230	$	229
Additional paid-in capital	194,774		193,640
Retained earnings	46,970		41,359
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	241,974		235,228
Noncontrolling interest	476		698
Total Equity	$	242,450	$	235,926
Total Liabilities and Stockholders' Equity	$	333,145	$	314,657

See accompanying notes to financial statements.

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Heritage-Crystal Clean, Inc.

Condensed Consolidated Statements of Income

(In Thousands, Except per Share Amounts)

(Unaudited)

		Second Quarter Ended,					First Half Ended,
		June 16, 2018		June 17, 2017			June 16, 2018		June 17, 2017
Revenues
	Product revenues	$	40,289	$	31,832		$	69,299	$	58,812
	Service revenues	60,014		54,550			114,151		108,023
Total revenues		$	100,303	$	86,382		$	183,450	$	166,835
Operating expenses
	Operating costs	$	76,272	$	63,270		$	144,658	$	124,560
	Selling, general, and administrative expenses	11,522		10,575			22,544		22,916
	Depreciation and amortization	3,659		4,184			7,302		8,316
	Other expense (income) - net	341		(3,027		)	729		(8,033		)
Operating income		8,509		11,380			8,217		19,076
Interest expense – net		240		412			486		499
Income before income taxes		8,269		10,968			7,731		18,577
Provision for income taxes		2,149		3,982			1,713		6,774
Net income		6,120		6,986			6,018		11,803
Income attributable to noncontrolling interest		121		52			139		105
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders		$	5,999	$	6,934		$	5,879	$	11,698
Net income per share: basic		$	0.26	$	0.31		$	0.26	$	0.52
Net income per share: diluted		$	0.26	$	0.30		$	0.25	$	0.51
Number of weighted average shares outstanding: basic		23,029		22,506			22,995		22,430
Number of weighted average shares outstanding: diluted		23,361		22,832			23,246		22,729

See accompanying notes to financial statements.

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Heritage-Crystal Clean, Inc.

Condensed Consolidated Statement of Stockholders’ Equity

(In Thousands, Except Share Amounts)

(Unaudited)

	Shares	Par Value Common		Additional Paid–in Capital			Retained Earnings			Total Heritage-Crystal Clean, Inc. Stockholders' Equity			Non-controlling Interest			Total Equity
Balance at December 30, 2017	22,891,674	$	229	$	193,640		$	41,359		$	235,228		$	698		$	235,926
Adjustment from adopting ASC 606	—	—		—			(268		)	(268		)	—			(268		)
Net income	—	—		—			5,879			5,879			139			6,018
Distribution	—	—		—			—			—			(361		)	(361		)
Issuance of common stock – ESPP	9,641	—		204			—			204			—			204
Exercise of stock options	12,440	—		91			—			91			—			91
Share-based compensation	129,217	1		1,868			—			1,869			—			1,869
Share repurchases to satisfy tax withholding obligations	—	—		(1,029		)	—			(1,029		)	—			(1,029		)
Balance at June 16, 2018	23,042,972	$	230	$	194,774		$	46,970		$	241,974		$	476		$	242,450

See accompanying notes to financial statements.

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Heritage-Crystal Clean, Inc.

Condensed Consolidated Statements of Cash Flows

(In Thousands)

(Unaudited)

	For First Half Ended,
	June 16, 2018			June 17, 2017
Cash flows from Operating Activities:
Net income	$	6,018		$	11,803
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,302			8,316
Bad debt provision	352			(6		)
Share-based compensation	1,869			1,348
Deferred taxes	1,704			6,506
Other, net	94			991
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(7,810		)	3,184
(Increase) in inventory	(5,031		)	(304		)
Decrease (increase) in other current assets	854			(356		)
Increase (decrease) in accounts payable	8,813			(1,771		)
(Decrease) in accrued liabilities	(1,323		)	(1,443		)
Cash provided by operating activities	$	12,842		$	28,268
Cash flows from Investing Activities:
Capital expenditures	$	(7,371	)	$	(6,333	)
Business acquisitions, net of cash acquired	(4,505		)	—
Proceeds from the disposal of assets	71			54
Cash used in investing activities	$	(11,805	)	$	(6,279	)
Cash flows from Financing Activities:
Payments on Term loan	$	—		$	(64,195	)
Proceeds from new Term Loan	—			30,000
Proceeds under revolving credit facility	—			4,000
Payments of revolving credit facility	—			(4,000		)
Proceeds from the exercise of stock options	91			2,357
Share repurchases to satisfy tax withholding obligations	(1,029		)	(356		)
Proceeds from the issuance of common stock	204			197
Payments of debt issuance costs	—			(1,050		)
Distributions to noncontrolling interest	(361		)	(310		)
Cash used in financing activities	$	(1,095	)	$	(33,357	)
Net decrease in cash and cash equivalents	(58		)	(11,368		)
Cash and cash equivalents, beginning of period	41,889			36,610
Cash and cash equivalents, end of period	$	41,831		$	25,242
Supplemental disclosure of cash flow information:
Income taxes paid	$	371		$	208
Cash paid for interest	535			733
Supplemental disclosure of non-cash information:
Payables for construction in progress	$	838		$	514

See accompanying notes to financial statements.

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HERITAGE-CRYSTAL CLEAN, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

June 16, 2018

(1)    ORGANIZATION AND NATURE OF OPERATIONS

Heritage-Crystal Clean, Inc., a Delaware corporation and its subsidiaries (collectively the “Company”), provides parts cleaning, hazardous and non-hazardous containerized waste, used oil collection, vacuum, antifreeze recycling and field services primarily to small and mid-sized industrial and vehicle maintenance customers. The Company owns and operates a used oil re-refinery where it re-refines used oils and sells high quality base oil for lubricants as well as other re-refinery products.  The Company also has multiple locations where it dehydrates used oil. The oil processed at these locations is sold as recycled fuel oil. The Company also operates multiple wastewater treatment plants and antifreeze recycling facilities at which it produces virgin-quality antifreeze. The Company operates in the United States and Ontario, Canada. The Company conducts its primary business operations through Heritage-Crystal Clean, LLC, its wholly owned subsidiary, and all intercompany balances have been eliminated in consolidation.

The Company has two reportable segments: "Environmental Services" and "Oil Business." The Environmental Services segment consists of the Company's parts cleaning, containerized waste management, vacuum truck services, antifreeze recycling activities, and field services. The Oil Business segment consists of the Company's used oil collection, recycled fuel oil sales, used oil re-refining activities, and used oil filter removal and disposal services. No customer represented greater than 10% of consolidated revenues for any of the periods presented. There were no intersegment revenues. Both segments operate in the United States and in Ontario, Canada.

The Company’s fiscal year ends on the Saturday closest to December 31. The most recent fiscal year ended on December 30, 2017.  Each of the Company's first three fiscal quarters consists of twelve weeks while the last fiscal quarter consists of sixteen or seventeen weeks.  

In the Company's Environmental Services segment, product revenues include sales of solvent, machines, absorbent, accessories, and antifreeze; service revenues include servicing of parts cleaning machines, drum waste removal services, vacuum truck services, field services, and other services. In the Company's Oil Business segment, product revenues include sales of re-refined base oil, recycled fuel oil, used oil, and other products; service revenues include revenues from used oil collection activities, collecting and disposing of waste water and removal and disposal of used oil filters. Due to the Company's integrated business model, it is impracticable to separately present costs of tangible products and costs of services.

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(2)    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The Company's significant accounting policies are described in Note 2, "Summary of Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the fiscal year ended December 30, 2017. There have been no material changes in these policies or their application with the exception of revenue recognition. See footnote 4 — Revenue for more information.

Recently Issued Accounting Pronouncements
Standard	Issuance Date	Description	Our Effective Date	Effect on the Financial Statements
ASU 2016-02 Leases (Topic 842)	February 2016	This update was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Early application of the amendments in this update is permitted for all entities.	January 4, 2019	The Company is currently evaluating the effect that implementation of this update will have on its consolidated financial position and results of operations. The Company anticipates that implementation of this standard will result in an increase to assets and an increase to liabilities. To date, certain personnel have attended technical training concerning this new lease accounting standard. The Company has engaged a third party to assist in implementing the standard and to provide a software solution to aid in accounting for leases.

Recently Issued Accounting Standards Adopted
Standard	Issuance Date	Description	Effective Date	Effect on the Financial Statements
ASU 2014-09 “Revenue from Contracts with Customers (Topic 606),” ASU 2014-15 “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” ASU 2016-08 “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU 2016-10 “ Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing,” and ASU 2016-12 “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”	May 2014 and subsequent	These standards outline a single comprehensive model for entities to use in accounting for revenue using a five-step process that supersedes virtually all existing revenue guidance. The underlying principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Entities have the option of using either a full retrospective approach or a modified retrospective approach to adopt the guidance. Early adoption is permitted.	December 31, 2017	On December 31, 2017, we adopted the new accounting standard ASC 606, “Revenue from Contracts with Customers” using the modified retrospective method. We recognized the cumulative effect as an adjustment to our opening balance of retained earnings.

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Effective December 31, 2017, we adopted the requirements of Topic 606. The cumulative effects of the changes made to our statement of income and balance sheet were as follows:

	For the Period ended June 16, 2018						For the First Half ended June 16, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change		As Reported		Balances Without Adoption of Topic 606		Effect of Change
(thousands)					Higher/(Lower)						Higher/(Lower)
Statement of Income
Service revenues	$	60,014	$	59,985	$	29	$	114,151	$	114,091	$	60
Total revenues	100,303		100,274		29		183,450		183,390		60
Operating income	8,509		8,480		29		8,217		8,157		60
Income before income taxes	8,269		8,240		29		7,731		7,671		60
Provision for income taxes	2,149		2,141		8		1,713		1,700		13
Net income	6,120		6,099		21		6,018		5,971		47
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	$	5,999	$	5,977	$	22	$	5,879	$	5,831	$	48

	June 16, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change
(thousands)					Higher/(Lower)
Balance Sheet
Contract liabilities - net	$	208	$	—	$	208
Total Current Liabilities	50,551		50,343		208
Deferred income taxes	11,260		11,247		13
Total Liabilities	90,695		90,474		221
Retained earnings	46,970		47,191		(221		)
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	241,974		242,195		(221		)
Total Equity	$	242,450	$	242,671	$	(221	)

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(3)    BUSINESS COMBINATIONS

On May 3, 2018, the Company purchased the assets of Products Plus, Inc. and AO Holding-Kansas City, LLC (collectively "PPI") pursuant to an Asset Purchase Agreement. The Company purchased the assets of PPI to expand the Company’s market share in the collection, recycling, and sales of a full line of antifreeze products. The purchase price was set at $5.8 million subject to certain adjustments, including a working capital adjustment and a contingent consideration provision, and is preliminarily allocated based on our estimates and assumptions of the approximate fair values of assets acquired on the acquisition date. We are still in the process of completing our valuation, and accordingly our estimates and assumptions are subject to change within the measurement period. The Company initially paid $4.2 million of cash at closing. The results of PPI are consolidated into the Company’s Environmental Services segment.

On June 11, 2018, the Company purchased the assets of Hot Tank Supply Company of Fresno, California ("HTSC") pursuant to an Asset Purchase Agreement. The Company purchased the assets of HTSC to expand the Company’s market share in California. The purchase price was set at $0.7 million subject to certain adjustments, including a working capital adjustment and a deferred and contingent consideration provision, and is preliminarily allocated based on our estimates and assumptions of the approximate fair values of assets acquired on the acquisition date. We are still in the process of completing our valuation, and accordingly our estimates and assumptions are subject to change within the measurement period. The Company initially paid $0.3 million of cash at closing. The results of HTSC are consolidated into the Company’s Environmental Services segment.

The following table summarizes the preliminary estimated fair values of the assets acquired, net of cash acquired, related to each acquisition:

	As of June 16, 2018
(thousands)	PPI			HTSC
Accounts receivable	$	909		$	48
Inventory	259			3
Property, plant, & equipment	1,969			47
Equipment at customers	—			104
Intangible assets	528			100
Goodwill	2,172			377
Total purchase price, net of cash acquired	$	5,837		$	679
Less: to be placed into escrow	(187		)	(49		)
Less: deferred consideration	—			(225		)
Less: contingent consideration	(1,450		)	(100		)
Net cash paid	$	4,200		$	305

(4) REVENUE

We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is recognized when our performance obligations under the terms of a contract with our customers are satisfied. Recognition occurs when the Company transfers control by completing the specified services at the point in time the customer benefits from the services performed or once our products are delivered. The Company measures progress toward complete satisfaction of a performance obligation satisfied over time using a cost-based input method. This method of measuring progress provides a faithful depiction of the transfer of goods or services because the costs incurred are expected to be substantially proportionate to the Company’s satisfaction of the performance obligation. Revenue is measured as the amount of consideration we expect to receive in exchange for completing our performance obligations. Sales tax and other taxes we collect with revenue-producing activities are excluded from revenue. In the case of contracts with multiple performance obligations, the Company allocates the transaction price to each performance obligation based on the relative stand-alone selling prices of the various goods and/or services encompassed by the contract. We do not have any material significant payment terms as payment is generally due within 30 days after the performance obligation has been satisfactorily completed. The Company has elected the practical expedient to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of

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the asset that we otherwise would have recognized is one year or less. In applying the guidance in Topic 606, there were no judgments or estimates made that the Company deems significant.

Accounts Receivable — Net, includes amounts billed and currently due from customers. The amounts due are stated at their net estimated realizable value. The allowance for doubtful accounts is the Company's best estimate of the amount of probable credit losses in the Company's existing accounts receivable. The Company determines the allowance based on analysis of customer credit worthiness and historical losses. Accounts receivable are written off once the Company determines the account to be uncollectible. The Company does not have any off-balance-sheet credit exposure related to its customers.

Contract Balances — Contract assets primarily relate to the Company’s rights to consideration for work completed in relation to its services performed but not billed at the reporting date. Contract liabilities primarily consist of advance payments of performance obligations yet to be fully satisfied in the period reported. Our contract liabilities and contract assets are reported in a net position at the end of each reporting period.

We disaggregate our revenue from contracts with customers by major lines of business for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

The following table disaggregates our revenue by major lines:

	For the Second Quarter Ended, June 16, 2018						For the First Half Ended, June 16, 2018
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Total		Environmental Services		Oil Business		Total
Parts cleaning, containerized waste, & related products/services	$	41,513	$	—	$	41,513	$	81,108	$	—	$	81,108
Vacuum Services & Wastewater Treatment	12,460		—		12,460		24,307		—		24,307
Antifreeze Business	4,003		—		4,003		7,462		—		7,462
Field Services	6,068		—		6,068		8,222		—		8,222
Environmental Services - Other	401		—		401		821		—		821
Re-refinery Product Sales	—		29,413		29,413		—		49,898		49,898
Oil Collection Services & RFO	—		5,096		5,096		—		9,113		9,113
Oil Filter Business	—		1,231		1,231		—		2,309		2,309
Revenues from Contracts with Customers	64,445		35,740		100,185		121,920		61,320		183,240
Other Revenue	—		118		118		—		210		210
Total Revenues	$	64,445	$	35,858	$	100,303	$	121,920	$	61,530	$	183,450

The following table provides information about contract assets and contract liabilities from contracts with customers:

(thousands)	June 16, 2018		December 31, 2017
Contract assets	$	71	$	59
Contract liabilities	279		327
Contract liabilities - net	$	208	$	268

During the quarter ended June 16, 2018, the Company recognized $16 thousand of revenue that was included in the contract liabilities balance as of December 31, 2017. During the first two quarters ended June 16, 2018, the Company recognized $0.3 million of revenue that was included in the contract liabilities balance as of December 31, 2017. The Company has no assets recognized from costs to obtain or fulfill a contract with a customer. We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

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(5)    ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Trade	$	50,675		$	43,301
Less: allowance for doubtful accounts	(1,826		)	(1,881		)
Trade - net	48,849			41,420
Related parties	2,045			1,906
Other	3,013			2,165
Total accounts receivable - net	$	53,907		$	45,491

The following table provides the changes in the Company’s allowance for doubtful accounts for the second quarter ended June 16, 2018, and the fiscal year ended December 30, 2017:

	For the Quarter Ended,			For the Fiscal Year Ended,
(thousands)	June 16, 2018			December 30, 2017
Balance at beginning of period	$	1,881		$	2,176
Provision for bad debts	352			402
Accounts written off, net of recoveries	(407		)	(697		)
Balance at end of period	$	1,826		$	1,881

(6)    INVENTORY

The carrying value of inventory consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Used oil and processed oil	$	8,989		$	5,788
Solvents and solutions	6,912			6,201
Drums and supplies	4,773			4,430
Machines	4,296			3,679
Other	2,255			1,936
Total inventory	27,225			22,034
Less: machine refurbishing reserve	(294		)	(395		)
Total inventory - net	$	26,931		$	21,639

Inventory consists primarily of used oil, processed oil, solvents and solutions, new and refurbished parts cleaning machines, drums and supplies, and other items. Inventories are valued at the lower of first-in, first-out (FIFO) cost or net realizable value, net of any reserves for excess, obsolete, or unsalable inventory. The Company routinely monitors its inventory levels at each of its locations and evaluates inventories for excess or slow-moving items. If circumstances indicate the cost of inventories exceed their recoverable value, inventories are reduced to net realizable value. The Company had no inventory write downs during the first half of fiscal 2018 or fiscal 2017.

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(7) PROPERTY, PLANT, AND EQUIPMENT

Property, plant, and equipment consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Machinery, vehicles, and equipment	$	87,711		$	85,427
Buildings and storage tanks	69,273			69,009
Land	9,552			9,562
Leasehold improvements	5,581			5,427
Construction in progress	13,787			9,378
Assets held for sale	53			53
Total property, plant and equipment	185,957			178,856
Less: accumulated depreciation	(54,402		)	(50,737		)
Property, plant and equipment - net	$	131,555		$	128,119
(thousands)	June 16, 2018			December 30, 2017
Equipment at customers	$	70,770		$	68,234
Less: accumulated depreciation	(46,919		)	(44,922		)
Equipment at customers - net	$	23,851		$	23,312

Depreciation expense for the second quarters ended June 16, 2018 and June 17, 2017 was $2.9 million and $3.4 million, respectively. Depreciation expense for the first half ended June 16, 2018 and June 17, 2017 was $5.9 million and $6.8 million, respectively.

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(8) GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill is measured as a residual amount as of the acquisition date, which in most cases results in measuring goodwill as an excess of the purchase consideration transferred plus the fair value of any noncontrolling interest in the acquiree over the fair value of the net assets acquired, including any contingent consideration. The Company tests goodwill for impairment annually in the fourth quarter and in interim periods if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company's determination of fair value requires certain assumptions and estimates, such as margin expectations, market conditions, growth expectations, expected changes in working capital, etc., regarding expected future profitability and expected future cash flows. The Company tests goodwill for impairment at each of its two reporting units, Environmental Services and Oil Business.

The following table shows changes to our goodwill balances by segment from December 30, 2017, to June 16, 2018:

(thousands)	Oil Business			Environmental Services		Total
Goodwill at December 31, 2016
Gross carrying amount	$	3,952		$	31,483	$	35,435
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at December 31, 2016	$	—		$	31,483	$	31,483
Measurement period adjustments	—			97		97
Goodwill at December 30, 2017
Gross carrying amount	3,952			31,580		35,532
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at December 30, 2017	$	—		$	31,580	$	31,580
Acquisitions	—			2,545		2,545
Goodwill at June 16, 2018
Gross carrying amount	3,952			34,125		38,077
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at June 16, 2018	$	—		$	34,125	$	34,125

The following is a summary of software and other intangible assets:

	June 16, 2018						December 30, 2017
(thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer & supplier relationships	$	23,694	$	10,117	$	13,577	$	23,077	$	9,027	$	14,050
Software	4,724		4,006		718		4,724		3,899		825
Non-compete agreements	2,942		2,786		156		2,949		2,617		332
Patents, formulae, and licenses	1,769		672		1,097		1,769		642		1,127
Other	1,348		991		357		1,348		950		398
Total software and intangible assets	$	34,477	$	18,572	$	15,905	$	33,867	$	17,135	$	16,732

Amortization expense was $0.7 million for the second quarter ended June 16, 2018, and $0.8 million for second quarter ended June 17, 2017. Amortization expense was $1.4 million for the first half ended June 16, 2018, and $1.5 million for the first half ended June 17, 2017. The weighted average useful lives of software; customer & supplier relationships; patents, formulae, and licenses; non-compete agreements, and other intangibles were 9 years, 10 years, 15 years, 5 years, and 6 years, respectively.

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The expected amortization expense for the remainder of fiscal 2018 and for fiscal years 2019, 2020, 2021, and 2022 is $1.6 million, $2.8 million, $2.6 million, $2.4 million, and $2.3 million, respectively. The preceding expected amortization expense is an estimate. Actual amounts of amortization expense may differ from estimated amounts due to additional intangible asset acquisitions, the finalization of the fair value of intangible assets that have been acquired from business combinations, disposal of intangible assets, accelerated amortization of intangible assets, and other events.

(9) ACCOUNTS PAYABLE

Accounts payable consisted of the following:

(thousands)	June 16, 2018		December 30, 2017
Accounts payable	$	34,649	$	25,540
Accounts payable - related parties	517		28
Total accounts payable	$	35,166	$	25,568

(10) DEBT AND FINANCING ARRANGEMENTS

Bank Credit Facility

The Company's Credit Agreement as amended ("Credit Agreement"), provides for borrowings of up to $95.0 million, subject to the satisfaction of certain terms and conditions, comprised of a term loan of $30.0 million and up to $65.0 million of borrowings under the revolving loan portion. The actual amount of borrowings available under the revolving loan portion of the Credit Agreement is limited by the Company's total leverage ratio. The amount available to draw at any point in time would be further reduced by any standby letters of credit issued.

Loans made under the Credit Agreement may be Base Rate Loans or LIBOR Rate Loans, at the election of the Company subject to certain exceptions. Base Rate Loans have an interest rate equal to (i) the higher of (a) the federal funds rate plus 0.5%, (b) the London Interbank Offering Rate (“LIBOR”) plus 1%, or (c) Bank of America's prime rate, plus (ii) a variable margin of between 0.75% and 1.75% depending on the Company's total leverage ratio, calculated on a consolidated basis. LIBOR rate loans have an interest rate equal to (i) the LIBOR rate plus (ii) a variable margin of between 1.75% and 2.75% depending on the Company's total leverage ratio. Amounts borrowed under the Credit Agreement are secured by a security interest in substantially all of the Company's tangible and intangible assets.

The Credit Agreement contains customary terms and provisions (including representations, covenants, and conditions) for transactions of this type. Certain covenants, among other things, restrict the Company's and its subsidiaries' ability to incur indebtedness, grant liens, make investments and sell assets. The Credit Agreement also contains customary events of default, covenants and representations and warranties. Financial covenants include:

• An interest coverage ratio (based on interest expense and EBITDA) of at least 3.5 to 1.0;

• A total leverage ratio no greater than 3.0 to 1.0, provided that in the event of a permitted acquisition having an aggregate consideration equal to $10.0 million or more, at the Borrower’s election, the foregoing 3.00 to 1.00 shall be deemed to be 3.25 to 1.00 for the fiscal quarter in which such permitted acquisition occurs and the three immediately following fiscal quarters and will thereafter revert to 3.00 to 1.00; and

• A capital expenditures covenant limiting capital expenditures to $100.0 million plus, if the capital expenditures permitted have been fully utilized, an additional amount for the remaining term of the Credit Agreement equal to 35% of EBITDA for the thirteen “four-week” periods most recently ended immediately prior to the full utilization of such $100.0 million basket.

The Credit Agreement places certain limitations on acquisitions and the payment of dividends.

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Debt at June 16, 2018 and December 30, 2017 consisted of the following:

(thousands)	June 16, 2018		December 30, 2017
Principal amount	$	30,000	$	30,000
Less: unamortized debt issuance costs	1,116		1,256
Debt less unamortized debt issuance costs	$	28,884	$	28,744

The Company recorded interest expense of $0.3 million on the term loan for the second quarter ended June 16, 2018, and $0.4 million for the second quarter ended June 17, 2017. During the first half of fiscal 2018, the Company recorded interest expense of $0.7 million on the term loan, and $0.9 million of interest on the term loan during the first half of fiscal 2017. In the first half of 2018, the Company also recorded $0.1 million of amortization of debt issuance costs. No interest was capitalized during the first half of fiscal 2018 or 2017.

The Company's weighted average interest rate for all debt as of June 16, 2018, and June 17, 2017 was 3.6% and 3.8%, respectively.

As of June 16, 2018 and December 30, 2017, the Company was in compliance with all covenants under its Credit Agreement. As of June 16, 2018 and December 30, 2017, the Company had $1.5 million and $0.9 million of standby letters of credit issued, respectively, and $63.5 million and $64.1 million was available for borrowing under the bank credit facility, respectively. We believe that the carrying value of our debt balance at June 16, 2018 approximates fair value.

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(11) SEGMENT INFORMATION

The Company has two reportable segments: "Environmental Services" and "Oil Business." The Environmental Services segment consists of the Company's parts cleaning, containerized waste management, vacuum truck service, antifreeze recycling activities, and field services. The Oil Business segment consists primarily of the Company's used oil collection, used oil re-refining activities, and the dehydration of used oil to be sold as recycled fuel oil.

No single customer in either segment accounted for more than 10.0% of consolidated revenues in any of the periods presented. There were no intersegment revenues. Both the Environmental Services and Oil Business segment operates in the United States and, to an immaterial degree, in Ontario, Canada. As such, the Company is not disclosing operating results by geographic segment.

Segment results for the second quarters ended June 16, 2018, and June 17, 2017 were as follows:

Second Quarter Ended,
June 16, 2018
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	7,521	$	32,768	$	—	$	40,289
	Service revenues	56,924		3,090		—		60,014
Total revenues		$	64,445	$	35,858	$	—	$	100,303
Operating expenses
	Operating costs	46,456		29,816		—		76,272
	Operating depreciation and amortization	1,502		1,389		—		2,891
Profit before corporate selling, general, and administrative expenses		$	16,487	$	4,653	$	—	$	21,140
Selling, general, and administrative expenses						11,522		11,522
Depreciation and amortization from SG&A						768		768
Total selling, general, and administrative expenses						$	12,290	$	12,290
Other expense - net						341		341
Operating income								8,509
Interest expense – net						240		240
Income before income taxes								$	8,269

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Second Quarter Ended,
June 17, 2017
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	5,868	$	25,964	$	—	$	31,832
	Service revenues	49,225		5,325		—		54,550
Total revenues		$	55,093	$	31,289	$	—	$	86,382
Operating expenses
	Operating costs	36,601		26,669		—		63,270
	Operating depreciation and amortization	1,801		1,535		—		3,336
Profit before corporate selling, general, and administrative expenses		$	16,691	$	3,085	$	—	$	19,776
Selling, general, and administrative expenses						10,575		10,575
Depreciation and amortization from SG&A						848		848
Total selling, general, and administrative expenses						$	11,423	$	11,423
Other (income) - net						(3,027)		(3,027)
Operating income								11,380
Interest expense – net						412		412
Income before income taxes								$	10,968

Segment results for the first half ended June 16, 2018, and June 17, 2017 were as follows:

First Half Ended,
June 16, 2018
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	13,964	$	55,335	$	—	$	69,299
	Service revenues	107,956		6,195		—		114,151
Total revenues		$	121,920	$	61,530	$	—	$	183,450
Operating expenses
	Operating costs	89,181		55,477		—		144,658
	Operating depreciation and amortization	2,992		2,777		—		5,769
Profit before corporate selling, general, and administrative expenses		$	29,747	$	3,276	$	—	$	33,023
Selling, general, and administrative expenses						22,544		22,544
Depreciation and amortization from SG&A						1,533		1,533
Total selling, general, and administrative expenses						$	24,077	$	24,077
Other expense - net						729		729
Operating income								8,217
Interest expense – net						486		486
Income before income taxes								$	7,731

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First Half Ended,
June 17, 2017
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	11,592	$	47,220	$	—	$	58,812
	Service revenues	96,716		11,307		—		108,023
Total revenues		$	108,308	$	58,527	$	—	$	166,835
Operating expenses
	Operating costs	73,121		51,439		—		124,560
	Operating depreciation and amortization	3,547		3,070		—		6,617
Profit before corporate selling, general, and administrative expenses		$	31,640	$	4,018	$	—	$	35,658
Selling, general, and administrative expenses						22,916		22,916
Depreciation and amortization from SG&A						1,699		1,699
Total selling, general, and administrative expenses						$	24,615	$	24,615
Other (income) - net						(8,033)		(8,033)
Operating income								19,076
Interest expense – net						499		499
Income before income taxes								$	18,577

Total assets by segment as of June 16, 2018, and December 30, 2017 were as follows:

(thousands)		June 16, 2018		December 30, 2017
Total Assets:
	Environmental Services	$	142,331	$	131,457
	Oil Business	138,657		129,936
	Unallocated Corporate Assets	52,157		53,264
	Total	$	333,145	$	314,657

Segment assets for the Environmental Services and Oil Business segments consist of property, plant, and equipment, intangible assets, accounts receivable, goodwill, and inventories. Assets for the corporate unallocated amounts consist of property, plant, and equipment used at the corporate headquarters as well as cash and net deferred tax assets.

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(12)    COMMITMENTS AND CONTINGENCIES

The Company may enter into purchase obligations with certain vendors. They represent expected payments to third party service providers and other commitments entered into during the normal course of our business. These purchase obligations are generally cancelable with or without notice, without penalty, although certain vendor agreements provide for cancellation fees or penalties depending on the terms of the contract.

The Company has purchase obligations in the form of open purchase orders of $21.4 million as of June 16, 2018, and $15.6 million as of December 30, 2017, primarily for used oil, solvent, machine purchases, disposal and transportation expenses, and capital expenditures.

The Company may be subject to investigations, claims or lawsuits as a result of operating its business, including matters governed by environmental laws and regulations. The Company may also be subject to tax audits in a variety of jurisdictions. When claims are asserted, the Company evaluates the likelihood that a loss will occur and records a liability for those instances when the likelihood is deemed probable and the exposure is reasonably estimable. The Company carries insurance at levels it believes are adequate to cover loss contingencies based on historical claims activity. When the potential loss exposure is limited to the insurance deductible and the likelihood of loss is determined to be probable, the Company accrues for the amount of the required deductible, unless a lower amount of exposure is estimated. As of June 16, 2018 and December 30, 2017, the Company had accrued $4.6 million and $4.5 million related to loss contingencies and other contingent liabilities, respectively.

(13)    INCOME TAXES

On December 22, 2017, the Tax Cuts and Jobs Act (the "Act") was enacted into law and introduced significant changes to U.S. tax law.  The Act reduces the U.S. federal corporate tax rate from 35% to 21%. The new legislation also sets forth a variety of other changes, including a limitation on the tax deductibility of interest expense, the acceleration of business asset expensing, a limitation on the use of net operating losses generated in future years, the repeal of the alternative minimum tax (AMT), and a reduction in the amount of executive pay that could qualify as a tax deduction.

Due to the timing and the complexity involved in applying the provisions of the Act, the Company did not record provisional amounts in our financial statements as of December 30, 2017 related to the one time deemed repatriation of foreign earnings. As the Company collects and prepares necessary data, and interprets the Act and any additional guidance issued by the U.S. Treasury Department, the Internal Revenue Service (IRS), and other standard-setting bodies, the Company will record the provisional amounts related to the one time deemed repatriation of its Canadian subsidiary’s accumulated foreign earnings. The accounting for the tax effects of the deemed repatriation of foreign earnings will be completed later in 2018. The Company estimates that the income related to the deemed repatriation will be offset by U.S. net operating losses.

The Company deducted for federal income tax purposes accelerated "bonus" depreciation on the majority of its capital expenditures for assets placed in service in fiscal 2011 through fiscal 2017. Therefore, the Company recorded a deferred tax liability related to the difference between the book basis and the tax basis of those assets. In addition, as a result of the federal bonus depreciation, the Company recorded a Net Operating Loss ("NOL") of $44.7 million, which will begin to expire in 2031. The unexpired balance of the NOL generated in 2011 is $6.3 million as of June 16, 2018. The Company recorded additional NOL during 2012 - 2015 of $13.0 million. The balance on the federal NOL’s generated from 2011 through 2015 at June 16, 2018 was $19.3 million, and the remaining deferred tax asset related to the Company's state and federal NOL was a tax effected balance of $4.8 million.

The Company's effective tax rate for the second quarter of fiscal 2018 was 26.0% compared to 36.3% in the second quarter of fiscal 2017. The Company’s effective rate for the first half of fiscal 2018 was 22.2% compared to 36.5% in the first half of fiscal 2017. The rate difference is principally attributable to the decrease in the federal corporate tax rate.

The Company establishes reserves when it is more likely than not that the Company will not realize the full tax benefit of a position. The Company had a reserve of $2.5 million for uncertain tax positions as of June 16, 2018 and December 30, 2017. The gross unrecognized tax benefits would, if recognized, decrease the Company's effective tax rate.

(14)    SHARE-BASED COMPENSATION

The aggregate number of shares of common stock which may be issued under the Company’s 2008 Omnibus Plan ("Plan") is 2,602,077 plus any common stock that becomes available for issuance pursuant to the reusage provision of the Plan. As of June 16, 2018, the number of shares available for issuance under the Plan was 180,150 shares.

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Stock Option Awards

A summary of stock option activity under this Plan is as follows:

Outstanding Stock Options	Number of Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value as of Date Listed (in thousands)
Options outstanding at December 30, 2017	19,435		$	7.33	1.23	$	280
Exercised	(12,440	)	7.33		—	—
Options outstanding at June 16, 2018	6,995		$	7.33	0.77	$	83

Restricted Stock Compensation/Awards

Annually, the Company grants restricted shares to its Board of Directors. The shares become fully vested one year from their grant date. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant. The Company amortizes the expense over the service period, which is the fiscal year in which the award is granted. In addition, the Company may grant restricted shares to certain members of management based on their services and contingent upon continued service with the Company. The restricted shares vest over a period of approximately three years from the grant date. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant.

Pursuant to the Heritage-Crystal Clean, Inc. Omnibus Incentive Plan of 2008, on April 13, 2018, the Company granted 350,000 shares of restricted stock to certain members of Management as part of a Special Incentive Program. The number of shares granted may be increased up to 612,500 shares depending on the Company’s level of performance with regard to certain market conditions. Between zero and 612,500 shares will vest on April 13, 2022, depending on the satisfaction of certain service and market conditions.

The following table shows a summary of restricted share grants and expense resulting from the awards:

			Compensation Expense
(thousands, except share amounts)			First Half Ended,				Unrecognized Expense as of,
Recipient of Grant	Grant Date	Restricted Shares	June 16, 2018		June 17, 2017		June 16, 2018		December 30, 2017
Members of Management	January, 2016	43,208	$	48	$	48	$	53	$	101
Members of Management	February, 2017	146,564	238		200		603		841
Chief Executive Officer	February, 2017	500,000	716		455		1,707		2,423
Board of Directors	April 2017	14,980	111		37		—		111
Members of Management	February, 2018	116,958	252		479		1,518		1,770
Special Incentive Grant	April, 2018	350,000	353		—		7,715		—
Board of Directors	May, 2018	13,800	44		—		241		—

In February 2017, as part of Mr. Recatto's employment agreement, the Company granted a restricted stock award of 500,000 shares of common stock, which vests through January 2021 in an amount based on the vesting table below, with the common stock price increase to be determined based on the increase in the price of the Company’s common stock (if any) from the closing price of the common stock as reported by Nasdaq on the employment commencement date ($15.00) and the common stock price on the potential vesting date (determined by using the weighted average closing price of a share of the Company's common stock for the 90-day period ending on the vesting date). If the stock price does not increase by $5.00, then no shares shall vest. During the first half of fiscal 2018, the Company recorded approximately $0.7 million of compensation expense, which includes $0.2 million of expense from the recognition of an accelerated vesting, related to this award. In the future, the Company expects to recognize compensation expense of approximately $1.7 million over the remaining requisite service period, which ends January 31, 2021.

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The fair value of this restricted stock award as of the grant date was estimated using a Monte Carlo simulation model. Key assumptions used in the Monte Carlo simulation to estimate the grant date fair value of this award are a risk-free rate of 1.70%, expected dividend yield of zero, and an expected volatility assumption of 41.73%.

Vesting Table
Increase in Stock Price From the Employment Commencement Date to the Vesting Date	Total percentage of Restricted Stock Shares to Be Vested
Less than $5 per share increase	—%
$5 per share increase	25%
$10 per share increase	50%
$15 per share increase	75%
$20 or more per share increase	100%

Provision for possible accelerated vesting of award

If the average closing price of the Company's common stock increases by the marginal levels set forth in the above vesting table for any consecutive 180 day period between the award date and final vesting date, Mr. Recatto shall become vested in 50% of the corresponding total percentage of restricted shares earned on the last day of the 180 day period. On March 14, 2018, the average closing price of the Company's common stock met the 25% marginal level and Mr. Recatto became fully vested in half of the 125,000 vested shares.

The following table summarizes the restricted stock activity for the first half ended June 16, 2018:

Restricted Stock (Nonvested Shares)	Number of Shares		Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at December 30, 2017	685,999		$	14.52
Granted	480,755		21.81
Vested	(149,710	)	14.57
Nonvested shares outstanding at June 16, 2018	1,017,044		$	18.20

Employee Stock Purchase Plan

As of June 16, 2018, the Company had reserved 140,385 shares of common stock available for purchase under the Employee Stock Purchase Plan of 2008. In the first half of fiscal 2018, employees purchased 9,641 shares of the Company’s common stock with a weighted average fair market value of $22.32 per share.

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(15)  EARNINGS PER SHARE

The following table reconciles the number of shares outstanding for the second quarters and the first half of fiscal 2018 and 2017, respectively, to the number of weighted average basic shares outstanding and the number of weighted average diluted shares outstanding for the purposes of calculating basic and diluted earnings per share:

	Second Quarter Ended,				First Half Ended,
(thousands, except share amounts)	June 16, 2018		June 17, 2017		June 16, 2018		June 17, 2017
Net income	$	6,120	$	6,986	$	6,018	$	11,803
Less: Income attributable to noncontrolling interest	121		52		139		105
Net income attributable to Heritage-Crystal Clean, Inc. available to common stockholders	$	5,999	$	6,934	$	5,879	$	11,698
Weighted average basic shares outstanding	23,029		22,506		22,995		22,430
Dilutive shares for share–based compensation plans	332		326		251		299
Weighted average diluted shares outstanding	23,361		22,832		23,246		22,729
Net income per share: basic	$	0.26	$	0.31	$	0.26	$	0.52
Net income per share: diluted	$	0.26	$	0.30	$	0.25	$	0.51

(16) OTHER EXPENSE (INCOME) - NET

Other expense of $0.7 million for the first half of fiscal 2018 primarily represents $0.5 million of site closure costs for a facility in Wilmington, DE. Other (income) for the first half of fiscal 2017 includes a gain of $5.1 million received in the first quarter of fiscal 2017 as a result of having received a partial award for a claim made in arbitration and a gain of $3.6 million received during the second quarter of fiscal 2017 from a settlement agreement, both of which were related to our acquisition of FCC Environmental, LLC and International Petroleum Corp. of Delaware in 2014.

ITEM 2.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Disclosure Regarding Forward-Looking Statements

You should read the following discussion in conjunction with our consolidated financial statements and related notes in our Annual Report on Form 10-K filed with the SEC on March 1, 2018. In addition to historical information, this discussion contains forward-looking statements that involve risks, uncertainties and assumptions that could cause actual results to differ materially from our expectations. These statements can be identified by the fact that they do not relate strictly to historical or current facts. They use words such as "aim," "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "plan," "project," "should," "will be," "will continue," "will likely result," "would" and other words and terms of similar meaning in conjunction with a discussion of future or estimated operating or financial performance. You should read statements that contain these words carefully, because they discuss our future expectations, contain projections of our future results of operations or of our financial position or state other “forward-looking” information. Forward-looking statements speak only as of the date of this quarterly report. Factors that could cause such differences include those described in the section titled “Risk Factors” and elsewhere in our Annual Report on Form 10-K for fiscal 2017 filed with the SEC on March 1, 2018. Except as required under federal securities laws and the rules and regulations of the SEC, we do not have any intention, and do not undertake, to update any forward-looking statements to reflect events or circumstances arising after the date of this quarterly report, whether as a result of new information, future events or otherwise. As a result of these risks and uncertainties, readers are cautioned not to place undue reliance on the forward-looking statements included in this quarterly report or that may be made elsewhere from time to time by, or on behalf of, us. All forward-looking statements attributable to us are expressly qualified by these cautionary statements. Certain tabular information may not foot due to rounding. Our fiscal year ends on the Saturday closest to December 31. Interim results are presented for the twelve weeks ("second quarter" or "quarter") and

24

twenty-four weeks (first "half") ended June 16, 2018 and June 17, 2017, respectively. "Fiscal 2017" represents the 52-week period ended December 30, 2017 and "Fiscal 2018" represents the 52-week period ending December 29, 2018.

Overview

We provide parts cleaning, containerized waste management, used oil collection, vacuum truck services, antifreeze recycling, and field services primarily to small and medium sized industrial customers as well as vehicle maintenance customers. We own and operate a used oil re-refinery, several wastewater treatment plants and multiple antifreeze recycling facilities. We believe we are the second largest provider of industrial and hazardous waste services to small and mid-sized customers in both the vehicle maintenance and manufacturing services sector in North America, and we have the second largest used oil re-refining capacity in North America.  Our services help our customers manage their used chemicals and liquid and solid wastes while also helping to minimize their regulatory burdens. We operate from a network of 89 branch facilities providing services to customers in 45 states and parts of Canada. We conduct business through two segments: Environmental Services and Oil Business.

Our Environmental Services segment revenues are generated primarily from providing parts cleaning services, containerized waste management, vacuum truck services, antifreeze recycling, and field services. Revenues from this segment accounted for approximately 66% of our total Company revenues for the first half of fiscal 2018. In the Environmental Services segment, we define and measure same-branch revenues for a given period as the subset of all our branches that have been open and operating throughout and between the periods being compared, and we refer to these as established branches. We calculate average revenues per working day by dividing our revenues by the number of non-holiday weekdays in the applicable fiscal year or fiscal quarter.

Our Oil Business segment consists of our used oil collection, used oil re-refining activities, and recycled fuel oil ("RFO") sales which accounted for approximately 34% of our total Company revenues in the first half of fiscal 2018.

Our operating costs include the costs of the materials we use in our products and services, such as used oil collected from customers or purchased from third party collectors, solvent, and other chemicals. The used solvent that we retrieve from customers in our product reuse program is accounted for as a reduction in our net cost of solvent under operating costs, whether placed in inventory or sold to a purchaser for reuse. Changes in the price of crude oil can impact operating costs indirectly as it may impact the price we pay for solvent or used oil, although we attempt to offset volatility in the oil markets by managing the spread between the costs we pay for our materials and the prices we charge for our products and services. Operating costs also include transportation of solvents and waste, payments to third parties to recycle or dispose of the waste materials that we collect, and the costs of operating our re-refinery, recycling centers, waste water treatment facilities, hubs, and branch system including personnel costs (including commissions), facility rent, truck leases, fuel, and maintenance. Our operating costs as a percentage of sales generally increase in relation to the number of new branch openings. As new branches achieve route density and scale efficiencies, our operating costs as a percentage of sales generally decrease.

We use profit before corporate selling, general, and administrative expenses ("SG&A") as a key measure of segment profitability. We define profit before corporate SG&A expense as revenue less operating costs and depreciation and amortization from operations.

Our corporate selling, general, and administrative expenses include the costs of performing centralized business functions, including sales management at or above the regional level, business management, billing, receivables management, accounting and finance, information technology, environmental health and safety, human resources and legal.

We operate a used oil re-refinery located in Indianapolis, Indiana, through which we recycle used oil into high quality lubricant base oil and other products. We supply the base oil to firms that produce and market finished lubricants. Our re-refinery has an annual nameplate capacity of approximately 75 million gallons of used oil feedstock, allowing it to produce approximately 47 million gallons of lubricating base oil per year when operating at full capacity.

Critical Accounting Policies

Critical accounting policies are those that are both important to the accurate portrayal of a company’s financial condition and results and require subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.

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In order to prepare financial statements that conform to accounting principles generally accepted in the United States, commonly referred to as GAAP, we make estimates and assumptions that affect the amounts reported in our financial statements and accompanying notes.  Certain estimates are particularly sensitive due to their significance to the financial statements and the possibility that future events may be significantly different from our expectations.

There were no material changes during the first half of fiscal 2018 to the information provided under the heading "Critical Accounting Policies" included in our Annual Report on Form 10-K for the fiscal year ended December 30, 2017 with the exception of revenue recognition. See footnote 4 — Revenue for more information.

26

RESULTS OF OPERATIONS

General

The following table sets forth certain operating data as a percentage of revenues for the periods indicated:

	For the Second Quarter Ended,				For the First Half Ended,
(thousands)	June 16, 2018		June 17, 2017		June 16, 2018		June 17, 2017
Revenues
Product revenues	$40,289	40.2%	$31,832	36.9%	$69,299	37.8%	$58,812	35.3%
Service revenues	60,014	59.8%	54,550	63.1%	114,151	62.2%	108,023	64.7%
Total revenues	$100,303	100.0%	$86,382	100.0%	$183,450	100.0%	$166,835	100.0%
Operating expenses
Operating costs	$76,272	76.0%	$63,270	73.2%	$144,658	78.9%	$124,560	74.7%
Selling, general and administrative expenses	11,522	11.5%	10,575	12.2%	22,544	12.3%	22,916	13.7%
Depreciation and amortization	3,659	3.6%	4,184	4.8%	7,302	4.0%	8,316	5.0%
Other expense (income) - net	341	0.3%	(3,027)	(3.5)%	729	0.4%	(8,033)	(4.8)%
Operating income	8,509	8.5%	11,380	13.2%	8,217	4.5%	19,076	11.4%
Interest expense – net	240	0.2%	412	0.5%	486	0.3%	499	0.3%
Income before income taxes	8,269	8.2%	10,968	12.7%	7,731	4.2%	18,577	11.1%
Provision for income taxes	2,149	2.1%	3,982	4.6%	1,713	0.9%	6,774	4.1%
Net income	6,120	6.1%	6,986	8.1%	6,018	3.3%	11,803	7.1%
Income attributable to noncontrolling interest	121	0.1%	52	0.1%	139	0.1%	105	0.1%
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	$5,999	6.0%	$6,934	8.0%	$5,879	3.2%	$11,698	7.0%

Revenues

For the second quarter of fiscal 2018, revenues increased $13.9 million, or 16.1%, from $86.4 million in the second quarter of fiscal 2017 to $100.3 million in the second quarter of fiscal 2018. For the first half of fiscal 2018, revenues increased $16.6 million, or 10.0%, from $166.8 million in the first half of fiscal 2017 to $183.4 million. The growth in revenue was mainly driven by a 12.6% year over year increase in our Environmental Services segment revenues as the Company saw revenue growth in all services lines of business, along with 5.1% year over year growth in our Oil Business segment due to stronger base oil pricing and higher volumes of base oil gallons sold.

Operating expenses

Operating costs

Operating costs increased $13.0 million, or 20.6%, from the second quarter of fiscal 2017 compared to the second quarter of fiscal 2018. Operating costs increased $20.1 million, or 16.2%, from the first half of fiscal 2017 to the first half of fiscal 2018. The main drivers of the increase was due to an increase in disposal costs, an increase in used oil collection and processing costs, and increased costs in labor. Higher expenses for disposal, in part, due to an outage at one of our main third-party disposal vendors during the first quarter of fiscal 2018, along with higher disposal costs associated with a special project in our field services line of business during the second quarter of fiscal 2018. Higher labor costs were primarily due to additional resources to support our growth initiatives.

We expect that in the future our operating costs in the Environmental Services business will continue to increase as ourservice volume increases; however, a decrease in crude oil prices could partially offset this cost increase because a decrease in price could cause a decline in the price we pay for parts cleaning solvent and diesel fuel. Likewise, an increase in crude oil prices could cause an increase in the price we pay for parts cleaning solvent and diesel fuel. In the Oil Business segment, our

27

operating costs could increase or decrease in the future depending on changes in the price for crude oil which could directly impact our used oil collection costs and processing costs at our re-refinery.

Selling, general, and administrative expenses

Selling, general, and administrative expenses increased $0.9 million, or 9.0%, from the second quarter of fiscal 2017 to the second quarter of fiscal 2018. Selling, general, and administrative expenses decreased $0.4 million, or 1.7%, from the first half of fiscal 2017 to the first half of fiscal 2018. The decrease in expense was mainly driven by lower legal and bank fees, partially offset by higher severance expense year over year.

Other expense (income) - net

Other expense (income) - net was $0.3 million of expense for the second quarter of fiscal 2018 compared to income of $3.0 million for the second quarter of fiscal 2017. Other income for the second quarter of fiscal 2017 was mainly driven by a gain of $3.6 million generated as a result of a settlement agreement related to our acquisition of FCC Environmental in 2014. Other (income) - net was $0.7 million of expense for the first half of fiscal 2018 compared to approximately $8.0 million of income for the first half of fiscal 2017. Other expense for the second quarter of fiscal 2018 was mainly driven by $0.5 million of site closure costs for a facility in Wilmington, DE. The first half of fiscal 2017 included a gain of $5.1 million received in the first quarter of fiscal 2017 as a result of having received a partial award for a claim made in arbitration, and the aforementioned gain of $3.6 million received during the second quarter of fiscal 2017, both of which were related to our acquisition of FCC Environmental, LLC and International Petroleum Corp. of Delaware in 2014.

Interest expense - net

Net interest expense for the second quarter of fiscal 2018 was $0.2 million compared to interest expense of $0.4 million in the second quarter of fiscal 2017. In both the first half of fiscal 2018 and fiscal 2017 we recorded net interest expense of $0.5 million.

Provision for income taxes

The Company's effective tax rate for the second quarter of fiscal 2018 was 26.0% compared to 36.3% in the second quarter of fiscal 2017. The Company’s effective rate for the first half of fiscal 2018 was 22.2% compared to 36.5% in the first half of fiscal 2017. The rate difference is principally attributable to the decrease in the federal corporate tax rate.

Segment Information

The following table presents revenues by reportable segment:

			For the Second Quarter Ended,				Change
(thousands)			June 16, 2018		June 17, 2017		$		%
Revenues:
	Environmental Services		$	64,445	$	55,093	$	9,352	17.0	%
	Oil Business		35,858		31,289		4,569		14.6	%
		Total	$	100,303	$	86,382	$	13,921	16.1	%

			For the First Half Ended,				Change
			June 16, 2018		June 17, 2017		$		%
Revenues:
	Environmental Services		$	121,920	$	108,308	$	13,612	12.6	%
	Oil Business		61,530		58,527		3,003		5.1	%
		Total	$	183,450	$	166,835	$	16,615	10.0	%

28

In the second quarter of fiscal 2018, Environmental Services revenue increased by $9.4 million, or 17.0%, from $55.1 million in the second quarter of fiscal 2017 to $64.4 million in the second quarter of fiscal 2018. The increase in revenue was driven by growth in all of our service lines with the strongest growth in field services. Our growth in field services was achieved in part due to one large project which contributed approximately $3.2 million in revenue during the second quarter of fiscal 2018. In the first half of fiscal 2018, Environmental Services revenues increased by $13.6 million, or 12.6%, from $108.3 million in the first half of fiscal 2017 to $121.9 million in the first half of fiscal 2018.

In the second quarter of fiscal 2018, Oil Business revenues were up $4.6 million, or 14.6%, compared to the second quarter of fiscal 2017. In the first half of fiscal 2018, Oil Business revenues increased $3.0 million, or 5.1%, compared to the first half of fiscal 2017. The increase in revenue was due to stronger base oil pricing and higher volumes of base oil gallons sold, due in part to record base oil production at our re-refinery during the second quarter of fiscal 2018. During the second quarter of fiscal 2018, we produced base oil at a rate of 105.2% of the nameplate capacity of our re-refinery compared to 93.9% during the second quarter of fiscal of 2017. During the second quarter of fiscal 2018, we sold approximately 10.7 million gallons of base oil compared to 9.8 million gallons during the second quarter of fiscal 2017.

Segment Profit (Loss) Before Corporate Selling, General and Administrative Expenses ("SG&A")

The following table presents profit (loss) by reportable segment before corporate SG&A expense:

		For the Second Quarter Ended,				Change
(thousands)		June 16, 2018		June 17, 2017		$			%
Profit (loss) before corporate SG&A*
	Environmental Services	$	16,487	$	16,691	$	(204	)	(1.2	)%
	Oil Business	4,653		3,085		1,568			50.8	%
	Total	$	21,140	$	19,776	$	1,364		6.9	%

		For the First Half Ended,				Change
June 16, 2018		June 17, 2017		$			%
Profit (loss) before corporate SG&A*
	Environmental Services	$	29,747	$	31,640	$	(1,893	)	(6.0)%
	Oil Business	3,276		4,018		(742		)	(18.5)%
	Total	$	33,023	$	35,658	$	(2,635	)	(7.4)%

*Includes depreciation and amortization related to operating activity but not depreciation and amortization related to corporate

selling, general, and administrative activity. For further discussion see Note 11 in our consolidated financial statements included elsewhere in this document.

Environmental Services profit before corporate SG&A expense decreased $0.2 million, in the second quarter of fiscal 2018 compared to the second quarter of fiscal 2017. Environmental Services profit before corporate SG&A expense decreased $1.9 million, or 6.0%, in the first half of fiscal 2018 compared to the first half of fiscal 2017. The decrease in profit before corporate SG&A is primarily due to higher disposal costs and the addition of sales and service resources during the first half of fiscal 2018 compared to fiscal 2017.

Oil Business profit before corporate SG&A expense increased $1.6 million in the second quarter of fiscal 2018 compared to the second quarter of fiscal 2017 mainly due to higher revenues, along with improved catalyst utilization, labor and benefits, and maintenance cost as a result of record base oil production at our re-refinery. Oil Business profit before corporate SG&A expense decreased $0.7 million in the first half of fiscal 2018, compared to the first half of fiscal 2017 due mainly to the higher maintenance costs and lower production volume due to re-refinery downtime, and higher cleanup costs due to site closure activities experienced during the first quarter of fiscal 2018.

29

FINANCIAL CONDITION

Liquidity and Capital Resources

Cash and Cash Equivalents

As of June 16, 2018 and December 30, 2017, cash and cash equivalents were $41.8 million and $41.9 million, respectively. Our primary sources of liquidity are cash flows from operations and funds available to borrow under our term loan and revolving bank credit facility.

Debt and Financing Arrangements

The Company's Credit Agreement as amended ("Credit Agreement"), provides for borrowings of up to $95.0 million, subject to the satisfaction of certain terms and conditions, comprised of a term loan of $30.0 million and up to $65.0 million of borrowings under the revolving loan portion. The actual amount available under the revolving loan portion of the Credit Agreement is limited by the Company's total leverage ratio. The amount available to draw at any point in time would be further reduced by any standby letters of credit issued.

Loans made under the Credit Agreement may be Base Rate Loans or LIBOR Rate Loans, at the election of the Company subject to certain exceptions. Base Rate Loans have an interest rate equal to (i) the higher of (a) the federal funds rate plus 0.5%, (b) the London Interbank Offering Rate (“LIBOR”) plus 1%, or (c) Bank of America's prime rate, plus (ii) a variable margin of between 0.75% and 1.75% depending on the Company's total leverage ratio, calculated on a consolidated basis. LIBOR rate loans have an interest rate equal to (i) the LIBOR rate plus (ii) a variable margin of between 1.75% and 2.75% depending on the Company's total leverage ratio. Amounts borrowed under the Credit Agreement are secured by a security interest in substantially all of the Company's tangible and intangible assets. In June 2017, the Company entered into a First Amendment to the Credit Agreement that expands the Company's ability to make dispositions without bank group approval.

The Credit Agreement contains customary terms and provisions (including representations, covenants, and conditions) for transactions of this type. Certain covenants, among other things, restrict the Company's and its subsidiaries' ability to incur indebtedness, grant liens, make investments and sell assets. The Credit Agreement contains customary events of default, covenants and representations and warranties. Financial covenants include:

• An interest coverage ratio (based on interest expense and EBITDA) of at least 3.5 to 1.0;

• A total leverage ratio no greater than 3.0 to 1.0, provided that in the event of a permitted acquisition having an aggregate consideration equal to $10.0 million or more, at the Borrower’s election, the foregoing 3.00 to 1.00 shall be deemed to be 3.25 to 1.00 for the fiscal quarter in which such permitted acquisition occurs and the three immediately following fiscal quarters and will thereafter revert to 3.00 to 1.00;

• A capital expenditures covenant limiting capital expenditures to $100.0 million plus, if the capital expenditures permitted have been fully utilized, an additional amount for the remaining term of the Agreement equal to 35% of EBITDA for the thirteen “four-week” periods most recently ended immediately prior to the full utilization of such $100.0 million basket.

As of June 16, 2018 and December 30, 2017, the Company was in compliance with all covenants under the Credit Agreement. As of June 16, 2018 and December 30, 2017, the Company had $1.5 million and $0.9 million of standby letters of credit issued, respectively, and $63.5 million and $64.1 million was available for borrowing under the bank credit facility, respectively. The actual amount available under the revolving loan portion of the Credit Agreement is limited by the Company's total leverage ratio.

The Company's weighted average interest rate for all debt as of June 16, 2018 and June 17, 2017 was 3.6% and 3.8%, respectively. As of June 16, 2018, the Company had $30.0 million outstanding under the term loan, and no amount outstanding under the revolving credit facility.

We believe that our existing cash, cash equivalents, available borrowings, and other sources of financings will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least the next 12 months. We cannot assure you that this will be the case or that our assumptions regarding revenues and expenses underlying this belief will be accurate. If, in the future, we require more liquidity than is available to us under our credit facility, we may need to raise additional funds through debt or equity offerings. Adequate funds may not be available when needed or may not be available on terms favorable to us. If additional funds are raised by issuing equity securities, dilution to existing stockholders may result. If

30

we raise additional funds by obtaining loans from third parties, the terms of those financing arrangements may include negative covenants or other restrictions on our business that could impair our operational flexibility, and would also require us to fund additional interest expense. If funding is insufficient at any time in the future, we may be unable to develop or enhance our products or services, take advantage of business opportunities, or respond to competitive pressures, any of which could have a material adverse effect on our business, financial condition and results of operations.

Summary of Cash Flow Activity

	For the First Half Ended,
(thousands)	June 16, 2018			June 17, 2017
Net cash provided by (used in):
Operating activities	$	12,842		$	28,268
Investing activities	(11,805		)	(6,279		)
Financing activities	(1,095		)	(33,357		)
Net decrease in cash and cash equivalents	$	(58	)	$	(11,368	)

The most significant items affecting the comparison of our operating activities for the first half of fiscal 2018 and the first half of fiscal 2017 are summarized below:

Net Cash Provided by Operating Activities —

• Earnings decrease — Our decrease in net income for the first half of fiscal 2018 negatively impacted our net cash provided by operating activities by $5.8 million compared to the first half fiscal 2017.

• Accounts Receivable — The increase in accounts receivable had an unfavorable impact on cash provided by operating activities of $11.0 million in the first half of fiscal 2018 compared to the first half of fiscal 2017 mainly due to higher sales in the first half of fiscal 2018 compared to the first half of fiscal 2017, along with a one-time receipt of $4.3 million related to a settlement agreement with the sellers of FCC Environmental in the first quarter of 2017.

• Accounts Payable — The increase in accounts payable favorably affected cash flows from operating activities by $10.6 million in the first half of fiscal 2018 compared to the first half of fiscal 2017. The increase in accounts payable was mainly driven by an increase in higher transportation and disposal cost related charges during the first half of fiscal 2018.

• Inventory — In the first half of fiscal 2018, the increase in inventory unfavorably affected cash flows from operating activities by $4.7 million compared to the first half of fiscal 2017 driven mainly by higher carrying value of inventory.

Net Cash Used in Investing Activities —

• Capital expenditures — We used $7.4 million and $6.3 million for capital expenditures during the first half of fiscal 2018 and the first half of fiscal 2017, respectively. During the first half of fiscal 2018 and the first half of fiscal 2017, we spent $2.6 million for capital improvements to the re-refinery. Additionally, in the first half of fiscal 2018, we spent approximately $2.5 million for purchases of parts cleaning machines compared to $2.2 million in the first half of fiscal 2017. The remaining $2.3 million of capital expenditures in the first half of fiscal 2018 was for other items compared to approximately $1.5 million spent in the first quarter of fiscal 2017 for other items.

• Business acquisitions, net of cash acquired  — We used $4.5 million of cash outflows for the acquisitions of Products Plus, Inc. and AO Holding-Kansas City, LLC, and Hot Tank Supply Company during the second quarter of fiscal 2018. See footnote 3  — Business Combinations.

31

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to interest rate risks primarily through borrowings under our bank Credit Facility.  Interest on this facility is based upon variable interest rates. Our weighted average borrowings under our Credit Facility during the first half of fiscal 2018 was $30.0 million, and the annual effective interest rate for the Credit Facility for the first half of fiscal 2018 was 3.6%. We currently do not hedge against interest rate risk. Based on the foregoing, a hypothetical 1% increase or decrease in interest rates would have resulted in a change of $0.3 million to our interest expense in the first half of fiscal 2018.

ITEM 4.  CONTROLS AND PROCEDURES

The Company's Chief Executive Officer and Chief Financial Officer have concluded, based on their evaluation as of the end of the period covered by this report, that the Company's disclosure controls and procedures (as defined in the Securities Exchange Act of 1934 Rules 13a-15(e) and 15d-15(e)) are effective to ensure that information required to be disclosed in the reports that the Company files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial

Officer, as appropriate, to allow timely decisions regarding financial disclosures.

Changes in Internal Control Over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting during the quarter ended June 16, 2018 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

32

PART II

ITEM 1.  LEGAL PROCEEDINGS

No change since previous filing.

ITEM 6.  EXHIBITS

10.1	First Amendment to the Credit Agreement
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document

*In accordance with Regulation S-T, the XBRL-related information in Exhibits 101 to this Quarterly Report on Form 10-Q shall be deemed to be "furnished" and not "filed."

33

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

HERITAGE-CRYSTAL CLEAN, INC.

Date:	July 26, 2018	By:	/s/ Mark DeVita
			Mark DeVita
			Chief Financial Officer

34

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF PRESIDENT AND CEO — PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO RULES 13a-14(A) AND 15d-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934

I, Brian Recatto, certify that:

1. I have reviewed this Form 10-Q for the period ended June 16, 2018 of Heritage-Crystal Clean, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 26, 2018	By: /s/ Brian Recatto
	Brian Recatto
	President, CEO and Director — Principal Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULES 13a-14(A) AND 15d-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934

I, Mark DeVita, certify that:

1. I have reviewed this Form 10-Q for the period ended June 16, 2018 of Heritage-Crystal Clean, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 26, 2018	By: /s/ Mark DeVita
	Mark DeVita
	Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Report of HERITAGE-CRYSTAL CLEAN, INC. (the “Company”) on Form 10-Q for the period ended June 16, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Brian Recatto, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 26, 2018	By: /s/ Brian Recatto
	Brian Recatto
	President, CEO and Director — Principal Executive Officer

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Report of HERITAGE-CRYSTAL CLEAN, INC. (the “Company”) on Form 10-Q for the period ended June 16, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark DeVita, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 26, 2018	By: /s/ Mark DeVita
	Mark DeVita
	Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 16, 2018	Jul. 23, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Heritage-Crystal Clean, Inc.
Entity Central Index Key	0001403431
Current Fiscal Year End Date	--12-29
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 16, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		23,048,501

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 16, 2018	Dec. 30, 2017
Current Assets:
Cash and cash equivalents	$ 41,831	$ 41,889
Accounts receivable - net	53,907	45,491
Inventory - net	26,931	21,639
Other current assets	5,040	5,895
Total Current Assets	127,709	114,914
Property, plant and equipment - net	131,555	128,119
Equipment at customers - net	23,851	23,312
Software and intangible assets - net	15,905	16,732
Goodwill	34,125	31,580
Total Assets	333,145	314,657
Current Liabilities:
Accounts payable	35,166	25,568
Contract liabilities - net	208	0
Accrued salaries, wages, and benefits	4,181	6,386
Taxes payable	6,475	5,787
Other current liabilities	4,521	2,690
Total Current Liabilities	50,551	40,431
Long-term debt	28,884	28,744
Deferred income taxes	11,260	9,556
Total Liabilities	90,695	78,731
STOCKHOLDERS' EQUITY:
Common stock - 26,000,000 shares authorized at $0.01 par value, 23,042,972 and 22,891,674 shares issued and outstanding at June 16, 2018 and December 30, 2017, respectively	230	229
Additional paid-in capital	194,774	193,640
Retained earnings	46,970	41,359
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	241,974	235,228
Noncontrolling interest	476	698
Total Equity	242,450	235,926
Total Liabilities and Stockholders' Equity	$ 333,145	$ 314,657

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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 16, 2018	Dec. 30, 2017
Statement of Financial Position [Abstract]
Common stock, shares authorized (in shares)	26,000,000	26,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	23,042,972	22,891,674
Common stock, shares outstanding (in shares)	23,042,972	22,891,674

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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017
Revenues
Product revenues	$ 40,289	$ 31,832	$ 69,299	$ 58,812
Service revenues	60,014	54,550	114,151	108,023
Total revenues	100,303	86,382	183,450	166,835
Operating expenses
Operating costs	76,272	63,270	144,658	124,560
Selling, general, and administrative expenses	11,522	10,575	22,544	22,916
Depreciation and amortization	3,659	4,184	7,302	8,316
Other expense (income) - net	341	(3,027)	729	(8,033)
Operating income	8,509	11,380	8,217	19,076
Interest expense – net	240	412	486	499
Income before income taxes	8,269	10,968	7,731	18,577
Provision for income taxes	2,149	3,982	1,713	6,774
Net income	6,120	6,986	6,018	11,803
Income attributable to noncontrolling interest	121	52	139	105
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	$ 5,999	$ 6,934	$ 5,879	$ 11,698
Net income per share: basic (in dollars per share)	$ 0.26	$ 0.31	$ 0.26	$ 0.52
Net income per share: diluted (in dollars per share)	$ 0.26	$ 0.30	$ 0.25	$ 0.51
Number of weighted average shares outstanding: basic (in shares)	23,029	22,506	22,995	22,430
Number of weighted average shares outstanding: diluted (in shares)	23,361	22,832	23,246	22,729

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Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional Paid–in Capital	Retained Earnings	Total Heritage-Crystal Clean, Inc. Stockholders' Equity	Non-controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment from adopting ASC 606	$ (268)			$ (268)	$ (268)
Beginning balance (in shares) at Dec. 30, 2017	22,891,674	22,891,674
Beginning balance at Dec. 30, 2017	$ 235,926	$ 229	$ 193,640	41,359	235,228	$ 698
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,018			5,879	5,879	139
Distribution	(361)					(361)
Issuance of common stock – ESPP (in shares)		9,641
Issuance of common stock – ESPP	$ 204		204		204
Exercise of stock options (in shares)	12,440	12,440
Exercise of stock options	$ 91		91		91
Share-based compensation (in shares)		129,217
Share-based compensation	1,869	$ 1	1,868		1,869
Share repurchases to satisfy tax withholding obligations	$ (1,029)				(1,029)
Ending balance (in shares) at Jun. 16, 2018	23,042,972	23,042,972
Ending balance at Jun. 16, 2018	$ 242,450	$ 230	$ 194,774	$ 46,970	$ 241,974	$ 476

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017
Cash flows from Operating Activities:
Net income	$ 6,018	$ 11,803
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,302	8,316
Bad debt provision	352	(6)
Share-based compensation	1,869	1,348
Deferred taxes	1,704	6,506
Other, net	94	991
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(7,810)	3,184
(Increase) in inventory	(5,031)	(304)
Decrease (increase) in other current assets	854	(356)
Increase (decrease) in accounts payable	8,813	(1,771)
(Decrease) in accrued liabilities	(1,323)	(1,443)
Cash provided by operating activities	12,842	28,268
Cash flows from Investing Activities:
Capital expenditures	(7,371)	(6,333)
Business acquisitions, net of cash acquired	(4,505)	0
Proceeds from the disposal of assets	71	54
Cash used in investing activities	(11,805)	(6,279)
Cash flows from Financing Activities:
Payments on Term loan	0	(64,195)
Proceeds from new Term Loan	0	30,000
Proceeds under revolving credit facility	0	4,000
Payments of revolving credit facility	0	(4,000)
Proceeds from the exercise of stock options	91	2,357
Share repurchases to satisfy tax withholding obligations	(1,029)	(356)
Proceeds from the issuance of common stock	204	197
Payments of debt issuance costs	0	(1,050)
Distributions to noncontrolling interest	(361)	(310)
Cash used in financing activities	(1,095)	(33,357)
Net decrease in cash and cash equivalents	(58)	(11,368)
Cash and cash equivalents, beginning of period	41,889	36,610
Cash and cash equivalents, end of period	41,831	25,242
Supplemental disclosure of cash flow information:
Income taxes paid	371	208
Cash paid for interest	535	733
Supplemental disclosure of non-cash information:
Payables for construction in progress	$ 838	$ 514

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Organization and Nature of Operations

6 Months Ended

Jun. 16, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Nature of Operations

ORGANIZATION AND NATURE OF OPERATIONS

Heritage-Crystal Clean, Inc., a Delaware corporation and its subsidiaries (collectively the “Company”), provides parts cleaning, hazardous and non-hazardous containerized waste, used oil collection, vacuum, antifreeze recycling and field services primarily to small and mid-sized industrial and vehicle maintenance customers. The Company owns and operates a used oil re-refinery where it re-refines used oils and sells high quality base oil for lubricants as well as other re-refinery products.  The Company also has multiple locations where it dehydrates used oil. The oil processed at these locations is sold as recycled fuel oil. The Company also operates multiple wastewater treatment plants and antifreeze recycling facilities at which it produces virgin-quality antifreeze. The Company operates in the United States and Ontario, Canada. The Company conducts its primary business operations through Heritage-Crystal Clean, LLC, its wholly owned subsidiary, and all intercompany balances have been eliminated in consolidation.

The Company has two reportable segments: "Environmental Services" and "Oil Business." The Environmental Services segment consists of the Company's parts cleaning, containerized waste management, vacuum truck services, antifreeze recycling activities, and field services. The Oil Business segment consists of the Company's used oil collection, recycled fuel oil sales, used oil re-refining activities, and used oil filter removal and disposal services. No customer represented greater than 10% of consolidated revenues for any of the periods presented. There were no intersegment revenues. Both segments operate in the United States and in Ontario, Canada.

The Company’s fiscal year ends on the Saturday closest to December 31. The most recent fiscal year ended on December 30, 2017.  Each of the Company's first three fiscal quarters consists of twelve weeks while the last fiscal quarter consists of sixteen or seventeen weeks.  

In the Company's Environmental Services segment, product revenues include sales of solvent, machines, absorbent, accessories, and antifreeze; service revenues include servicing of parts cleaning machines, drum waste removal services, vacuum truck services, field services, and other services. In the Company's Oil Business segment, product revenues include sales of re-refined base oil, recycled fuel oil, used oil, and other products; service revenues include revenues from used oil collection activities, collecting and disposing of waste water and removal and disposal of used oil filters. Due to the Company's integrated business model, it is impracticable to separately present costs of tangible products and costs of services.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 16, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The Company's significant accounting policies are described in Note 2, "Summary of Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the fiscal year ended December 30, 2017. There have been no material changes in these policies or their application with the exception of revenue recognition. See footnote 4 — Revenue for more information.

Recently Issued Accounting Pronouncements
Standard	Issuance Date	Description	Our Effective Date	Effect on the Financial Statements
ASU 2016-02 Leases (Topic 842)	February 2016	This update was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Early application of the amendments in this update is permitted for all entities.	January 4, 2019	The Company is currently evaluating the effect that implementation of this update will have on its consolidated financial position and results of operations. The Company anticipates that implementation of this standard will result in an increase to assets and an increase to liabilities. To date, certain personnel have attended technical training concerning this new lease accounting standard. The Company has engaged a third party to assist in implementing the standard and to provide a software solution to aid in accounting for leases.

Recently Issued Accounting Standards Adopted
Standard	Issuance Date	Description	Effective Date	Effect on the Financial Statements
ASU 2014-09 “Revenue from Contracts with Customers (Topic 606),” ASU 2014-15 “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” ASU 2016-08 “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU 2016-10 “ Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing,” and ASU 2016-12 “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”	May 2014 and subsequent	These standards outline a single comprehensive model for entities to use in accounting for revenue using a five-step process that supersedes virtually all existing revenue guidance. The underlying principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Entities have the option of using either a full retrospective approach or a modified retrospective approach to adopt the guidance. Early adoption is permitted.	December 31, 2017	On December 31, 2017, we adopted the new accounting standard ASC 606, “Revenue from Contracts with Customers” using the modified retrospective method. We recognized the cumulative effect as an adjustment to our opening balance of retained earnings.

Effective December 31, 2017, we adopted the requirements of Topic 606. The cumulative effects of the changes made to our statement of income and balance sheet were as follows:

	For the Period ended June 16, 2018						For the First Half ended June 16, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change		As Reported		Balances Without Adoption of Topic 606		Effect of Change
(thousands)					Higher/(Lower)						Higher/(Lower)
Statement of Income
Service revenues	$	60,014	$	59,985	$	29	$	114,151	$	114,091	$	60
Total revenues	100,303		100,274		29		183,450		183,390		60
Operating income	8,509		8,480		29		8,217		8,157		60
Income before income taxes	8,269		8,240		29		7,731		7,671		60
Provision for income taxes	2,149		2,141		8		1,713		1,700		13
Net income	6,120		6,099		21		6,018		5,971		47
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	$	5,999	$	5,977	$	22	$	5,879	$	5,831	$	48

	June 16, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change
(thousands)					Higher/(Lower)
Balance Sheet
Contract liabilities - net	$	208	$	—	$	208
Total Current Liabilities	50,551		50,343		208
Deferred income taxes	11,260		11,247		13
Total Liabilities	90,695		90,474		221
Retained earnings	46,970		47,191		(221		)
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	241,974		242,195		(221		)
Total Equity	$	242,450	$	242,671	$	(221	)

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Business Combinations

6 Months Ended

Jun. 16, 2018

Business Combinations [Abstract]

Business Combinations

BUSINESS COMBINATIONS

On May 3, 2018, the Company purchased the assets of Products Plus, Inc. and AO Holding-Kansas City, LLC (collectively "PPI") pursuant to an Asset Purchase Agreement. The Company purchased the assets of PPI to expand the Company’s market share in the collection, recycling, and sales of a full line of antifreeze products. The purchase price was set at $5.8 million subject to certain adjustments, including a working capital adjustment and a contingent consideration provision, and is preliminarily allocated based on our estimates and assumptions of the approximate fair values of assets acquired on the acquisition date. We are still in the process of completing our valuation, and accordingly our estimates and assumptions are subject to change within the measurement period. The Company initially paid $4.2 million of cash at closing. The results of PPI are consolidated into the Company’s Environmental Services segment.

On June 11, 2018, the Company purchased the assets of Hot Tank Supply Company of Fresno, California ("HTSC") pursuant to an Asset Purchase Agreement. The Company purchased the assets of HTSC to expand the Company’s market share in California. The purchase price was set at $0.7 million subject to certain adjustments, including a working capital adjustment and a deferred and contingent consideration provision, and is preliminarily allocated based on our estimates and assumptions of the approximate fair values of assets acquired on the acquisition date. We are still in the process of completing our valuation, and accordingly our estimates and assumptions are subject to change within the measurement period. The Company initially paid $0.3 million of cash at closing. The results of HTSC are consolidated into the Company’s Environmental Services segment.

The following table summarizes the preliminary estimated fair values of the assets acquired, net of cash acquired, related to each acquisition:

	As of June 16, 2018
(thousands)	PPI			HTSC
Accounts receivable	$	909		$	48
Inventory	259			3
Property, plant, & equipment	1,969			47
Equipment at customers	—			104
Intangible assets	528			100
Goodwill	2,172			377
Total purchase price, net of cash acquired	$	5,837		$	679
Less: to be placed into escrow	(187		)	(49		)
Less: deferred consideration	—			(225		)
Less: contingent consideration	(1,450		)	(100		)
Net cash paid	$	4,200		$	305

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Revenue

6 Months Ended

Jun. 16, 2018

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is recognized when our performance obligations under the terms of a contract with our customers are satisfied. Recognition occurs when the Company transfers control by completing the specified services at the point in time the customer benefits from the services performed or once our products are delivered. The Company measures progress toward complete satisfaction of a performance obligation satisfied over time using a cost-based input method. This method of measuring progress provides a faithful depiction of the transfer of goods or services because the costs incurred are expected to be substantially proportionate to the Company’s satisfaction of the performance obligation. Revenue is measured as the amount of consideration we expect to receive in exchange for completing our performance obligations. Sales tax and other taxes we collect with revenue-producing activities are excluded from revenue. In the case of contracts with multiple performance obligations, the Company allocates the transaction price to each performance obligation based on the relative stand-alone selling prices of the various goods and/or services encompassed by the contract. We do not have any material significant payment terms as payment is generally due within 30 days after the performance obligation has been satisfactorily completed. The Company has elected the practical expedient to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that we otherwise would have recognized is one year or less. In applying the guidance in Topic 606, there were no judgments or estimates made that the Company deems significant.

Accounts Receivable — Net, includes amounts billed and currently due from customers. The amounts due are stated at their net estimated realizable value. The allowance for doubtful accounts is the Company's best estimate of the amount of probable credit losses in the Company's existing accounts receivable. The Company determines the allowance based on analysis of customer credit worthiness and historical losses. Accounts receivable are written off once the Company determines the account to be uncollectible. The Company does not have any off-balance-sheet credit exposure related to its customers.

Contract Balances — Contract assets primarily relate to the Company’s rights to consideration for work completed in relation to its services performed but not billed at the reporting date. Contract liabilities primarily consist of advance payments of performance obligations yet to be fully satisfied in the period reported. Our contract liabilities and contract assets are reported in a net position at the end of each reporting period.

We disaggregate our revenue from contracts with customers by major lines of business for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

The following table disaggregates our revenue by major lines:

	For the Second Quarter Ended, June 16, 2018						For the First Half Ended, June 16, 2018
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Total		Environmental Services		Oil Business		Total
Parts cleaning, containerized waste, & related products/services	$	41,513	$	—	$	41,513	$	81,108	$	—	$	81,108
Vacuum Services & Wastewater Treatment	12,460		—		12,460		24,307		—		24,307
Antifreeze Business	4,003		—		4,003		7,462		—		7,462
Field Services	6,068		—		6,068		8,222		—		8,222
Environmental Services - Other	401		—		401		821		—		821
Re-refinery Product Sales	—		29,413		29,413		—		49,898		49,898
Oil Collection Services & RFO	—		5,096		5,096		—		9,113		9,113
Oil Filter Business	—		1,231		1,231		—		2,309		2,309
Revenues from Contracts with Customers	64,445		35,740		100,185		121,920		61,320		183,240
Other Revenue	—		118		118		—		210		210
Total Revenues	$	64,445	$	35,858	$	100,303	$	121,920	$	61,530	$	183,450

The following table provides information about contract assets and contract liabilities from contracts with customers:

(thousands)	June 16, 2018		December 31, 2017
Contract assets	$	71	$	59
Contract liabilities	279		327
Contract liabilities - net	$	208	$	268

During the quarter ended June 16, 2018, the Company recognized $16 thousand of revenue that was included in the contract liabilities balance as of December 31, 2017. During the first two quarters ended June 16, 2018, the Company recognized $0.3 million of revenue that was included in the contract liabilities balance as of December 31, 2017. The Company has no assets recognized from costs to obtain or fulfill a contract with a customer. We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

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Accounts Receivable

6 Months Ended

Jun. 16, 2018

Accounts Receivable, Net [Abstract]

Accounts Receivable

ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Trade	$	50,675		$	43,301
Less: allowance for doubtful accounts	(1,826		)	(1,881		)
Trade - net	48,849			41,420
Related parties	2,045			1,906
Other	3,013			2,165
Total accounts receivable - net	$	53,907		$	45,491

The following table provides the changes in the Company’s allowance for doubtful accounts for the second quarter ended June 16, 2018, and the fiscal year ended December 30, 2017:

	For the Quarter Ended,			For the Fiscal Year Ended,
(thousands)	June 16, 2018			December 30, 2017
Balance at beginning of period	$	1,881		$	2,176
Provision for bad debts	352			402
Accounts written off, net of recoveries	(407		)	(697		)
Balance at end of period	$	1,826		$	1,881

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Inventory

6 Months Ended

Jun. 16, 2018

Inventory Disclosure [Abstract]

Inventory

INVENTORY

The carrying value of inventory consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Used oil and processed oil	$	8,989		$	5,788
Solvents and solutions	6,912			6,201
Drums and supplies	4,773			4,430
Machines	4,296			3,679
Other	2,255			1,936
Total inventory	27,225			22,034
Less: machine refurbishing reserve	(294		)	(395		)
Total inventory - net	$	26,931		$	21,639

Inventory consists primarily of used oil, processed oil, solvents and solutions, new and refurbished parts cleaning machines, drums and supplies, and other items. Inventories are valued at the lower of first-in, first-out (FIFO) cost or net realizable value, net of any reserves for excess, obsolete, or unsalable inventory. The Company routinely monitors its inventory levels at each of its locations and evaluates inventories for excess or slow-moving items. If circumstances indicate the cost of inventories exceed their recoverable value, inventories are reduced to net realizable value. The Company had no inventory write downs during the first half of fiscal 2018 or fiscal 2017.

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Property, Plant, and Equipment

6 Months Ended

Jun. 16, 2018

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment

PROPERTY, PLANT, AND EQUIPMENT

Property, plant, and equipment consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Machinery, vehicles, and equipment	$	87,711		$	85,427
Buildings and storage tanks	69,273			69,009
Land	9,552			9,562
Leasehold improvements	5,581			5,427
Construction in progress	13,787			9,378
Assets held for sale	53			53
Total property, plant and equipment	185,957			178,856
Less: accumulated depreciation	(54,402		)	(50,737		)
Property, plant and equipment - net	$	131,555		$	128,119
(thousands)	June 16, 2018			December 30, 2017
Equipment at customers	$	70,770		$	68,234
Less: accumulated depreciation	(46,919		)	(44,922		)
Equipment at customers - net	$	23,851		$	23,312

Depreciation expense for the second quarters ended June 16, 2018 and June 17, 2017 was $2.9 million and $3.4 million, respectively. Depreciation expense for the first half ended June 16, 2018 and June 17, 2017 was $5.9 million and $6.8 million, respectively.

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Goodwill and Other Intangible Assets

6 Months Ended

Jun. 16, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill is measured as a residual amount as of the acquisition date, which in most cases results in measuring goodwill as an excess of the purchase consideration transferred plus the fair value of any noncontrolling interest in the acquiree over the fair value of the net assets acquired, including any contingent consideration. The Company tests goodwill for impairment annually in the fourth quarter and in interim periods if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company's determination of fair value requires certain assumptions and estimates, such as margin expectations, market conditions, growth expectations, expected changes in working capital, etc., regarding expected future profitability and expected future cash flows. The Company tests goodwill for impairment at each of its two reporting units, Environmental Services and Oil Business.

The following table shows changes to our goodwill balances by segment from December 30, 2017, to June 16, 2018:

(thousands)	Oil Business			Environmental Services		Total
Goodwill at December 31, 2016
Gross carrying amount	$	3,952		$	31,483	$	35,435
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at December 31, 2016	$	—		$	31,483	$	31,483
Measurement period adjustments	—			97		97
Goodwill at December 30, 2017
Gross carrying amount	3,952			31,580		35,532
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at December 30, 2017	$	—		$	31,580	$	31,580
Acquisitions	—			2,545		2,545
Goodwill at June 16, 2018
Gross carrying amount	3,952			34,125		38,077
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at June 16, 2018	$	—		$	34,125	$	34,125

The following is a summary of software and other intangible assets:

	June 16, 2018						December 30, 2017
(thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer & supplier relationships	$	23,694	$	10,117	$	13,577	$	23,077	$	9,027	$	14,050
Software	4,724		4,006		718		4,724		3,899		825
Non-compete agreements	2,942		2,786		156		2,949		2,617		332
Patents, formulae, and licenses	1,769		672		1,097		1,769		642		1,127
Other	1,348		991		357		1,348		950		398
Total software and intangible assets	$	34,477	$	18,572	$	15,905	$	33,867	$	17,135	$	16,732

Amortization expense was $0.7 million for the second quarter ended June 16, 2018, and $0.8 million for second quarter ended June 17, 2017. Amortization expense was $1.4 million for the first half ended June 16, 2018, and $1.5 million for the first half ended June 17, 2017. The weighted average useful lives of software; customer & supplier relationships; patents, formulae, and licenses; non-compete agreements, and other intangibles were 9 years, 10 years, 15 years, 5 years, and 6 years, respectively.

The expected amortization expense for the remainder of fiscal 2018 and for fiscal years 2019, 2020, 2021, and 2022 is $1.6 million, $2.8 million, $2.6 million, $2.4 million, and $2.3 million, respectively. The preceding expected amortization expense is an estimate. Actual amounts of amortization expense may differ from estimated amounts due to additional intangible asset acquisitions, the finalization of the fair value of intangible assets that have been acquired from business combinations, disposal of intangible assets, accelerated amortization of intangible assets, and other events.

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Accounts Payable

6 Months Ended

Jun. 16, 2018

Payables and Accruals [Abstract]

Accounts Payable

ACCOUNTS PAYABLE

Accounts payable consisted of the following:

(thousands)	June 16, 2018		December 30, 2017
Accounts payable	$	34,649	$	25,540
Accounts payable - related parties	517		28
Total accounts payable	$	35,166	$	25,568

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Debt and Financing Arrangements

6 Months Ended

Jun. 16, 2018

Debt Disclosure [Abstract]

Debt and Financing Arrangements

DEBT AND FINANCING ARRANGEMENTS

Bank Credit Facility

The Company's Credit Agreement as amended ("Credit Agreement"), provides for borrowings of up to $95.0 million, subject to the satisfaction of certain terms and conditions, comprised of a term loan of $30.0 million and up to $65.0 million of borrowings under the revolving loan portion. The actual amount of borrowings available under the revolving loan portion of the Credit Agreement is limited by the Company's total leverage ratio. The amount available to draw at any point in time would be further reduced by any standby letters of credit issued.

Loans made under the Credit Agreement may be Base Rate Loans or LIBOR Rate Loans, at the election of the Company subject to certain exceptions. Base Rate Loans have an interest rate equal to (i) the higher of (a) the federal funds rate plus 0.5%, (b) the London Interbank Offering Rate (“LIBOR”) plus 1%, or (c) Bank of America's prime rate, plus (ii) a variable margin of between 0.75% and 1.75% depending on the Company's total leverage ratio, calculated on a consolidated basis. LIBOR rate loans have an interest rate equal to (i) the LIBOR rate plus (ii) a variable margin of between 1.75% and 2.75% depending on the Company's total leverage ratio. Amounts borrowed under the Credit Agreement are secured by a security interest in substantially all of the Company's tangible and intangible assets.

The Credit Agreement contains customary terms and provisions (including representations, covenants, and conditions) for transactions of this type. Certain covenants, among other things, restrict the Company's and its subsidiaries' ability to incur indebtedness, grant liens, make investments and sell assets. The Credit Agreement also contains customary events of default, covenants and representations and warranties. Financial covenants include:

• An interest coverage ratio (based on interest expense and EBITDA) of at least 3.5 to 1.0;

• A total leverage ratio no greater than 3.0 to 1.0, provided that in the event of a permitted acquisition having an aggregate consideration equal to $10.0 million or more, at the Borrower’s election, the foregoing 3.00 to 1.00 shall be deemed to be 3.25 to 1.00 for the fiscal quarter in which such permitted acquisition occurs and the three immediately following fiscal quarters and will thereafter revert to 3.00 to 1.00; and

• A capital expenditures covenant limiting capital expenditures to $100.0 million plus, if the capital expenditures permitted have been fully utilized, an additional amount for the remaining term of the Credit Agreement equal to 35% of EBITDA for the thirteen “four-week” periods most recently ended immediately prior to the full utilization of such $100.0 million basket.

The Credit Agreement places certain limitations on acquisitions and the payment of dividends.

Debt at June 16, 2018 and December 30, 2017 consisted of the following:

(thousands)	June 16, 2018		December 30, 2017
Principal amount	$	30,000	$	30,000
Less: unamortized debt issuance costs	1,116		1,256
Debt less unamortized debt issuance costs	$	28,884	$	28,744

The Company recorded interest expense of $0.3 million on the term loan for the second quarter ended June 16, 2018, and $0.4 million for the second quarter ended June 17, 2017. During the first half of fiscal 2018, the Company recorded interest expense of $0.7 million on the term loan, and $0.9 million of interest on the term loan during the first half of fiscal 2017. In the first half of 2018, the Company also recorded $0.1 million of amortization of debt issuance costs. No interest was capitalized during the first half of fiscal 2018 or 2017.

The Company's weighted average interest rate for all debt as of June 16, 2018, and June 17, 2017 was 3.6% and 3.8%, respectively.

As of June 16, 2018 and December 30, 2017, the Company was in compliance with all covenants under its Credit Agreement. As of June 16, 2018 and December 30, 2017, the Company had $1.5 million and $0.9 million of standby letters of credit issued, respectively, and $63.5 million and $64.1 million was available for borrowing under the bank credit facility, respectively. We believe that the carrying value of our debt balance at June 16, 2018 approximates fair value.

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Segment Information

6 Months Ended

Jun. 16, 2018

Segment Reporting [Abstract]

Segment Information

SEGMENT INFORMATION

The Company has two reportable segments: "Environmental Services" and "Oil Business." The Environmental Services segment consists of the Company's parts cleaning, containerized waste management, vacuum truck service, antifreeze recycling activities, and field services. The Oil Business segment consists primarily of the Company's used oil collection, used oil re-refining activities, and the dehydration of used oil to be sold as recycled fuel oil.

No single customer in either segment accounted for more than 10.0% of consolidated revenues in any of the periods presented. There were no intersegment revenues. Both the Environmental Services and Oil Business segment operates in the United States and, to an immaterial degree, in Ontario, Canada. As such, the Company is not disclosing operating results by geographic segment.

Segment results for the second quarters ended June 16, 2018, and June 17, 2017 were as follows:

Second Quarter Ended,
June 16, 2018
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	7,521	$	32,768	$	—	$	40,289
	Service revenues	56,924		3,090		—		60,014
Total revenues		$	64,445	$	35,858	$	—	$	100,303
Operating expenses
	Operating costs	46,456		29,816		—		76,272
	Operating depreciation and amortization	1,502		1,389		—		2,891
Profit before corporate selling, general, and administrative expenses		$	16,487	$	4,653	$	—	$	21,140
Selling, general, and administrative expenses						11,522		11,522
Depreciation and amortization from SG&A						768		768
Total selling, general, and administrative expenses						$	12,290	$	12,290
Other expense - net						341		341
Operating income								8,509
Interest expense – net						240		240
Income before income taxes								$	8,269

Second Quarter Ended,
June 17, 2017
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	5,868	$	25,964	$	—	$	31,832
	Service revenues	49,225		5,325		—		54,550
Total revenues		$	55,093	$	31,289	$	—	$	86,382
Operating expenses
	Operating costs	36,601		26,669		—		63,270
	Operating depreciation and amortization	1,801		1,535		—		3,336
Profit before corporate selling, general, and administrative expenses		$	16,691	$	3,085	$	—	$	19,776
Selling, general, and administrative expenses						10,575		10,575
Depreciation and amortization from SG&A						848		848
Total selling, general, and administrative expenses						$	11,423	$	11,423
Other (income) - net						(3,027)		(3,027)
Operating income								11,380
Interest expense – net						412		412
Income before income taxes								$	10,968

Segment results for the first half ended June 16, 2018, and June 17, 2017 were as follows:

First Half Ended,
June 16, 2018
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	13,964	$	55,335	$	—	$	69,299
	Service revenues	107,956		6,195		—		114,151
Total revenues		$	121,920	$	61,530	$	—	$	183,450
Operating expenses
	Operating costs	89,181		55,477		—		144,658
	Operating depreciation and amortization	2,992		2,777		—		5,769
Profit before corporate selling, general, and administrative expenses		$	29,747	$	3,276	$	—	$	33,023
Selling, general, and administrative expenses						22,544		22,544
Depreciation and amortization from SG&A						1,533		1,533
Total selling, general, and administrative expenses						$	24,077	$	24,077
Other expense - net						729		729
Operating income								8,217
Interest expense – net						486		486
Income before income taxes								$	7,731

First Half Ended,
June 17, 2017
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	11,592	$	47,220	$	—	$	58,812
	Service revenues	96,716		11,307		—		108,023
Total revenues		$	108,308	$	58,527	$	—	$	166,835
Operating expenses
	Operating costs	73,121		51,439		—		124,560
	Operating depreciation and amortization	3,547		3,070		—		6,617
Profit before corporate selling, general, and administrative expenses		$	31,640	$	4,018	$	—	$	35,658
Selling, general, and administrative expenses						22,916		22,916
Depreciation and amortization from SG&A						1,699		1,699
Total selling, general, and administrative expenses						$	24,615	$	24,615
Other (income) - net						(8,033)		(8,033)
Operating income								19,076
Interest expense – net						499		499
Income before income taxes								$	18,577

Total assets by segment as of June 16, 2018, and December 30, 2017 were as follows:

(thousands)		June 16, 2018		December 30, 2017
Total Assets:
	Environmental Services	$	142,331	$	131,457
	Oil Business	138,657		129,936
	Unallocated Corporate Assets	52,157		53,264
	Total	$	333,145	$	314,657

Segment assets for the Environmental Services and Oil Business segments consist of property, plant, and equipment, intangible assets, accounts receivable, goodwill, and inventories. Assets for the corporate unallocated amounts consist of property, plant, and equipment used at the corporate headquarters as well as cash and net deferred tax assets.

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Commitments and Contingencies

6 Months Ended

Jun. 16, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

The Company may enter into purchase obligations with certain vendors. They represent expected payments to third party service providers and other commitments entered into during the normal course of our business. These purchase obligations are generally cancelable with or without notice, without penalty, although certain vendor agreements provide for cancellation fees or penalties depending on the terms of the contract.

The Company has purchase obligations in the form of open purchase orders of $21.4 million as of June 16, 2018, and $15.6 million as of December 30, 2017, primarily for used oil, solvent, machine purchases, disposal and transportation expenses, and capital expenditures.

The Company may be subject to investigations, claims or lawsuits as a result of operating its business, including matters governed by environmental laws and regulations. The Company may also be subject to tax audits in a variety of jurisdictions. When claims are asserted, the Company evaluates the likelihood that a loss will occur and records a liability for those instances when the likelihood is deemed probable and the exposure is reasonably estimable. The Company carries insurance at levels it believes are adequate to cover loss contingencies based on historical claims activity. When the potential loss exposure is limited to the insurance deductible and the likelihood of loss is determined to be probable, the Company accrues for the amount of the required deductible, unless a lower amount of exposure is estimated. As of June 16, 2018 and December 30, 2017, the Company had accrued $4.6 million and $4.5 million related to loss contingencies and other contingent liabilities, respectively.

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Income Taxes

6 Months Ended

Jun. 16, 2018

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

On December 22, 2017, the Tax Cuts and Jobs Act (the "Act") was enacted into law and introduced significant changes to U.S. tax law.  The Act reduces the U.S. federal corporate tax rate from 35% to 21%. The new legislation also sets forth a variety of other changes, including a limitation on the tax deductibility of interest expense, the acceleration of business asset expensing, a limitation on the use of net operating losses generated in future years, the repeal of the alternative minimum tax (AMT), and a reduction in the amount of executive pay that could qualify as a tax deduction.

Due to the timing and the complexity involved in applying the provisions of the Act, the Company did not record provisional amounts in our financial statements as of December 30, 2017 related to the one time deemed repatriation of foreign earnings. As the Company collects and prepares necessary data, and interprets the Act and any additional guidance issued by the U.S. Treasury Department, the Internal Revenue Service (IRS), and other standard-setting bodies, the Company will record the provisional amounts related to the one time deemed repatriation of its Canadian subsidiary’s accumulated foreign earnings. The accounting for the tax effects of the deemed repatriation of foreign earnings will be completed later in 2018. The Company estimates that the income related to the deemed repatriation will be offset by U.S. net operating losses.

The Company deducted for federal income tax purposes accelerated "bonus" depreciation on the majority of its capital expenditures for assets placed in service in fiscal 2011 through fiscal 2017. Therefore, the Company recorded a deferred tax liability related to the difference between the book basis and the tax basis of those assets. In addition, as a result of the federal bonus depreciation, the Company recorded a Net Operating Loss ("NOL") of $44.7 million, which will begin to expire in 2031. The unexpired balance of the NOL generated in 2011 is $6.3 million as of June 16, 2018. The Company recorded additional NOL during 2012 - 2015 of $13.0 million. The balance on the federal NOL’s generated from 2011 through 2015 at June 16, 2018 was $19.3 million, and the remaining deferred tax asset related to the Company's state and federal NOL was a tax effected balance of $4.8 million.

The Company's effective tax rate for the second quarter of fiscal 2018 was 26.0% compared to 36.3% in the second quarter of fiscal 2017. The Company’s effective rate for the first half of fiscal 2018 was 22.2% compared to 36.5% in the first half of fiscal 2017. The rate difference is principally attributable to the decrease in the federal corporate tax rate.

The Company establishes reserves when it is more likely than not that the Company will not realize the full tax benefit of a position. The Company had a reserve of $2.5 million for uncertain tax positions as of June 16, 2018 and December 30, 2017. The gross unrecognized tax benefits would, if recognized, decrease the Company's effective tax rate.

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Share-based Compensation

6 Months Ended

Jun. 16, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation

SHARE-BASED COMPENSATION

The aggregate number of shares of common stock which may be issued under the Company’s 2008 Omnibus Plan ("Plan") is 2,602,077 plus any common stock that becomes available for issuance pursuant to the reusage provision of the Plan. As of June 16, 2018, the number of shares available for issuance under the Plan was 180,150 shares.

Stock Option Awards

A summary of stock option activity under this Plan is as follows:

Outstanding Stock Options	Number of Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value as of Date Listed (in thousands)
Options outstanding at December 30, 2017	19,435		$	7.33	1.23	$	280
Exercised	(12,440	)	7.33		—	—
Options outstanding at June 16, 2018	6,995		$	7.33	0.77	$	83

Restricted Stock Compensation/Awards

Annually, the Company grants restricted shares to its Board of Directors. The shares become fully vested one year from their grant date. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant. The Company amortizes the expense over the service period, which is the fiscal year in which the award is granted. In addition, the Company may grant restricted shares to certain members of management based on their services and contingent upon continued service with the Company. The restricted shares vest over a period of approximately three years from the grant date. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant.

Pursuant to the Heritage-Crystal Clean, Inc. Omnibus Incentive Plan of 2008, on April 13, 2018, the Company granted 350,000 shares of restricted stock to certain members of Management as part of a Special Incentive Program. The number of shares granted may be increased up to 612,500 shares depending on the Company’s level of performance with regard to certain market conditions. Between zero and 612,500 shares will vest on April 13, 2022, depending on the satisfaction of certain service and market conditions.

The following table shows a summary of restricted share grants and expense resulting from the awards:

			Compensation Expense
(thousands, except share amounts)			First Half Ended,				Unrecognized Expense as of,
Recipient of Grant	Grant Date	Restricted Shares	June 16, 2018		June 17, 2017		June 16, 2018		December 30, 2017
Members of Management	January, 2016	43,208	$	48	$	48	$	53	$	101
Members of Management	February, 2017	146,564	238		200		603		841
Chief Executive Officer	February, 2017	500,000	716		455		1,707		2,423
Board of Directors	April 2017	14,980	111		37		—		111
Members of Management	February, 2018	116,958	252		479		1,518		1,770
Special Incentive Grant	April, 2018	350,000	353		—		7,715		—
Board of Directors	May, 2018	13,800	44		—		241		—

In February 2017, as part of Mr. Recatto's employment agreement, the Company granted a restricted stock award of 500,000 shares of common stock, which vests through January 2021 in an amount based on the vesting table below, with the common stock price increase to be determined based on the increase in the price of the Company’s common stock (if any) from the closing price of the common stock as reported by Nasdaq on the employment commencement date ($15.00) and the common stock price on the potential vesting date (determined by using the weighted average closing price of a share of the Company's common stock for the 90-day period ending on the vesting date). If the stock price does not increase by $5.00, then no shares shall vest. During the first half of fiscal 2018, the Company recorded approximately $0.7 million of compensation expense, which includes $0.2 million of expense from the recognition of an accelerated vesting, related to this award. In the future, the Company expects to recognize compensation expense of approximately $1.7 million over the remaining requisite service period, which ends January 31, 2021. The fair value of this restricted stock award as of the grant date was estimated using a Monte Carlo simulation model. Key assumptions used in the Monte Carlo simulation to estimate the grant date fair value of this award are a risk-free rate of 1.70%, expected dividend yield of zero, and an expected volatility assumption of 41.73%.

Vesting Table
Increase in Stock Price From the Employment Commencement Date to the Vesting Date	Total percentage of Restricted Stock Shares to Be Vested
Less than $5 per share increase	—%
$5 per share increase	25%
$10 per share increase	50%
$15 per share increase	75%
$20 or more per share increase	100%

Provision for possible accelerated vesting of award

If the average closing price of the Company's common stock increases by the marginal levels set forth in the above vesting table for any consecutive 180 day period between the award date and final vesting date, Mr. Recatto shall become vested in 50% of the corresponding total percentage of restricted shares earned on the last day of the 180 day period. On March 14, 2018, the average closing price of the Company's common stock met the 25% marginal level and Mr. Recatto became fully vested in half of the 125,000 vested shares.

The following table summarizes the restricted stock activity for the first half ended June 16, 2018:

Restricted Stock (Nonvested Shares)	Number of Shares		Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at December 30, 2017	685,999		$	14.52
Granted	480,755		21.81
Vested	(149,710	)	14.57
Nonvested shares outstanding at June 16, 2018	1,017,044		$	18.20

Employee Stock Purchase Plan

As of June 16, 2018, the Company had reserved 140,385 shares of common stock available for purchase under the Employee Stock Purchase Plan of 2008. In the first half of fiscal 2018, employees purchased 9,641 shares of the Company’s common stock with a weighted average fair market value of $22.32 per share.

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Earnings Per Share

6 Months Ended

Jun. 16, 2018

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

The following table reconciles the number of shares outstanding for the second quarters and the first half of fiscal 2018 and 2017, respectively, to the number of weighted average basic shares outstanding and the number of weighted average diluted shares outstanding for the purposes of calculating basic and diluted earnings per share:

	Second Quarter Ended,				First Half Ended,
(thousands, except share amounts)	June 16, 2018		June 17, 2017		June 16, 2018		June 17, 2017
Net income	$	6,120	$	6,986	$	6,018	$	11,803
Less: Income attributable to noncontrolling interest	121		52		139		105
Net income attributable to Heritage-Crystal Clean, Inc. available to common stockholders	$	5,999	$	6,934	$	5,879	$	11,698
Weighted average basic shares outstanding	23,029		22,506		22,995		22,430
Dilutive shares for share–based compensation plans	332		326		251		299
Weighted average diluted shares outstanding	23,361		22,832		23,246		22,729
Net income per share: basic	$	0.26	$	0.31	$	0.26	$	0.52
Net income per share: diluted	$	0.26	$	0.30	$	0.25	$	0.51

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Other Expense (Income) - Net

6 Months Ended

Jun. 16, 2018

Other Income and Expenses [Abstract]

Other Expense (Income) - Net

OTHER EXPENSE (INCOME) - NET

Other expense of $0.7 million for the first half of fiscal 2018 primarily represents $0.5 million of site closure costs for a facility in Wilmington, DE. Other (income) for the first half of fiscal 2017 includes a gain of $5.1 million received in the first quarter of fiscal 2017 as a result of having received a partial award for a claim made in arbitration and a gain of $3.6 million received during the second quarter of fiscal 2017 from a settlement agreement, both of which were related to our acquisition of FCC Environmental, LLC and International Petroleum Corp. of Delaware in 2014.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 16, 2018

Accounting Policies [Abstract]

Fiscal Period

The Company’s fiscal year ends on the Saturday closest to December 31. The most recent fiscal year ended on December 30, 2017.  Each of the Company's first three fiscal quarters consists of twelve weeks while the last fiscal quarter consists of sixteen or seventeen weeks.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements
Standard	Issuance Date	Description	Our Effective Date	Effect on the Financial Statements
ASU 2016-02 Leases (Topic 842)	February 2016	This update was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Early application of the amendments in this update is permitted for all entities.	January 4, 2019	The Company is currently evaluating the effect that implementation of this update will have on its consolidated financial position and results of operations. The Company anticipates that implementation of this standard will result in an increase to assets and an increase to liabilities. To date, certain personnel have attended technical training concerning this new lease accounting standard. The Company has engaged a third party to assist in implementing the standard and to provide a software solution to aid in accounting for leases.

Recently Issued Accounting Standards Adopted
Standard	Issuance Date	Description	Effective Date	Effect on the Financial Statements
ASU 2014-09 “Revenue from Contracts with Customers (Topic 606),” ASU 2014-15 “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” ASU 2016-08 “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU 2016-10 “ Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing,” and ASU 2016-12 “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”	May 2014 and subsequent	These standards outline a single comprehensive model for entities to use in accounting for revenue using a five-step process that supersedes virtually all existing revenue guidance. The underlying principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Entities have the option of using either a full retrospective approach or a modified retrospective approach to adopt the guidance. Early adoption is permitted.	December 31, 2017	On December 31, 2017, we adopted the new accounting standard ASC 606, “Revenue from Contracts with Customers” using the modified retrospective method. We recognized the cumulative effect as an adjustment to our opening balance of retained earnings.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 16, 2018

Accounting Policies [Abstract]

Schedule of Recently Issued Accounting Pronouncements

Effective December 31, 2017, we adopted the requirements of Topic 606. The cumulative effects of the changes made to our statement of income and balance sheet were as follows:

	For the Period ended June 16, 2018						For the First Half ended June 16, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change		As Reported		Balances Without Adoption of Topic 606		Effect of Change
(thousands)					Higher/(Lower)						Higher/(Lower)
Statement of Income
Service revenues	$	60,014	$	59,985	$	29	$	114,151	$	114,091	$	60
Total revenues	100,303		100,274		29		183,450		183,390		60
Operating income	8,509		8,480		29		8,217		8,157		60
Income before income taxes	8,269		8,240		29		7,731		7,671		60
Provision for income taxes	2,149		2,141		8		1,713		1,700		13
Net income	6,120		6,099		21		6,018		5,971		47
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	$	5,999	$	5,977	$	22	$	5,879	$	5,831	$	48

	June 16, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change
(thousands)					Higher/(Lower)
Balance Sheet
Contract liabilities - net	$	208	$	—	$	208
Total Current Liabilities	50,551		50,343		208
Deferred income taxes	11,260		11,247		13
Total Liabilities	90,695		90,474		221
Retained earnings	46,970		47,191		(221		)
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	241,974		242,195		(221		)
Total Equity	$	242,450	$	242,671	$	(221	)

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Business Combinations (Tables)

6 Months Ended

Jun. 16, 2018

Business Combinations [Abstract]

Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the preliminary estimated fair values of the assets acquired, net of cash acquired, related to each acquisition:

	As of June 16, 2018
(thousands)	PPI			HTSC
Accounts receivable	$	909		$	48
Inventory	259			3
Property, plant, & equipment	1,969			47
Equipment at customers	—			104
Intangible assets	528			100
Goodwill	2,172			377
Total purchase price, net of cash acquired	$	5,837		$	679
Less: to be placed into escrow	(187		)	(49		)
Less: deferred consideration	—			(225		)
Less: contingent consideration	(1,450		)	(100		)
Net cash paid	$	4,200		$	305

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Revenue (Tables)

6 Months Ended

Jun. 16, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue by Major Lines

The following table disaggregates our revenue by major lines:

	For the Second Quarter Ended, June 16, 2018						For the First Half Ended, June 16, 2018
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Total		Environmental Services		Oil Business		Total
Parts cleaning, containerized waste, & related products/services	$	41,513	$	—	$	41,513	$	81,108	$	—	$	81,108
Vacuum Services & Wastewater Treatment	12,460		—		12,460		24,307		—		24,307
Antifreeze Business	4,003		—		4,003		7,462		—		7,462
Field Services	6,068		—		6,068		8,222		—		8,222
Environmental Services - Other	401		—		401		821		—		821
Re-refinery Product Sales	—		29,413		29,413		—		49,898		49,898
Oil Collection Services & RFO	—		5,096		5,096		—		9,113		9,113
Oil Filter Business	—		1,231		1,231		—		2,309		2,309
Revenues from Contracts with Customers	64,445		35,740		100,185		121,920		61,320		183,240
Other Revenue	—		118		118		—		210		210
Total Revenues	$	64,445	$	35,858	$	100,303	$	121,920	$	61,530	$	183,450

Contract Assets and Contract Liabilities from Contracts with Customers

The following table provides information about contract assets and contract liabilities from contracts with customers:

(thousands)	June 16, 2018		December 31, 2017
Contract assets	$	71	$	59
Contract liabilities	279		327
Contract liabilities - net	$	208	$	268

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Accounts Receivable (Tables)

6 Months Ended

Jun. 16, 2018

Accounts Receivable, Net [Abstract]

Schedule of Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Trade	$	50,675		$	43,301
Less: allowance for doubtful accounts	(1,826		)	(1,881		)
Trade - net	48,849			41,420
Related parties	2,045			1,906
Other	3,013			2,165
Total accounts receivable - net	$	53,907		$	45,491

The following table provides the changes in the Company’s allowance for doubtful accounts for the second quarter ended June 16, 2018, and the fiscal year ended December 30, 2017:

	For the Quarter Ended,			For the Fiscal Year Ended,
(thousands)	June 16, 2018			December 30, 2017
Balance at beginning of period	$	1,881		$	2,176
Provision for bad debts	352			402
Accounts written off, net of recoveries	(407		)	(697		)
Balance at end of period	$	1,826		$	1,881

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Inventory (Tables)

6 Months Ended

Jun. 16, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

The carrying value of inventory consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Used oil and processed oil	$	8,989		$	5,788
Solvents and solutions	6,912			6,201
Drums and supplies	4,773			4,430
Machines	4,296			3,679
Other	2,255			1,936
Total inventory	27,225			22,034
Less: machine refurbishing reserve	(294		)	(395		)
Total inventory - net	$	26,931		$	21,639

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Property, Plant, and Equipment (Tables)

6 Months Ended

Jun. 16, 2018

Property, Plant and Equipment [Abstract]

Summary of Property, Plant, and Equipment

Property, plant, and equipment consisted of the following:

(thousands)	June 16, 2018			December 30, 2017
Machinery, vehicles, and equipment	$	87,711		$	85,427
Buildings and storage tanks	69,273			69,009
Land	9,552			9,562
Leasehold improvements	5,581			5,427
Construction in progress	13,787			9,378
Assets held for sale	53			53
Total property, plant and equipment	185,957			178,856
Less: accumulated depreciation	(54,402		)	(50,737		)
Property, plant and equipment - net	$	131,555		$	128,119
(thousands)	June 16, 2018			December 30, 2017
Equipment at customers	$	70,770		$	68,234
Less: accumulated depreciation	(46,919		)	(44,922		)
Equipment at customers - net	$	23,851		$	23,312

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Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 16, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table shows changes to our goodwill balances by segment from December 30, 2017, to June 16, 2018:

(thousands)	Oil Business			Environmental Services		Total
Goodwill at December 31, 2016
Gross carrying amount	$	3,952		$	31,483	$	35,435
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at December 31, 2016	$	—		$	31,483	$	31,483
Measurement period adjustments	—			97		97
Goodwill at December 30, 2017
Gross carrying amount	3,952			31,580		35,532
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at December 30, 2017	$	—		$	31,580	$	31,580
Acquisitions	—			2,545		2,545
Goodwill at June 16, 2018
Gross carrying amount	3,952			34,125		38,077
Accumulated impairment loss	(3,952		)	—		(3,952		)
Net book value at June 16, 2018	$	—		$	34,125	$	34,125

Schedule of Intangible Assets

The following is a summary of software and other intangible assets:

	June 16, 2018						December 30, 2017
(thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer & supplier relationships	$	23,694	$	10,117	$	13,577	$	23,077	$	9,027	$	14,050
Software	4,724		4,006		718		4,724		3,899		825
Non-compete agreements	2,942		2,786		156		2,949		2,617		332
Patents, formulae, and licenses	1,769		672		1,097		1,769		642		1,127
Other	1,348		991		357		1,348		950		398
Total software and intangible assets	$	34,477	$	18,572	$	15,905	$	33,867	$	17,135	$	16,732

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Accounts Payable (Tables)

6 Months Ended

Jun. 16, 2018

Payables and Accruals [Abstract]

Schedule of Accounts Payable

Accounts payable consisted of the following:

(thousands)	June 16, 2018		December 30, 2017
Accounts payable	$	34,649	$	25,540
Accounts payable - related parties	517		28
Total accounts payable	$	35,166	$	25,568

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Debt and Financing Arrangements (Tables)

6 Months Ended

Jun. 16, 2018

Debt Disclosure [Abstract]

Schedule of Debt

Debt at June 16, 2018 and December 30, 2017 consisted of the following:

(thousands)	June 16, 2018		December 30, 2017
Principal amount	$	30,000	$	30,000
Less: unamortized debt issuance costs	1,116		1,256
Debt less unamortized debt issuance costs	$	28,884	$	28,744

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Segment Information (Tables)

6 Months Ended

Jun. 16, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Segment results for the second quarters ended June 16, 2018, and June 17, 2017 were as follows:

Second Quarter Ended,
June 16, 2018
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	7,521	$	32,768	$	—	$	40,289
	Service revenues	56,924		3,090		—		60,014
Total revenues		$	64,445	$	35,858	$	—	$	100,303
Operating expenses
	Operating costs	46,456		29,816		—		76,272
	Operating depreciation and amortization	1,502		1,389		—		2,891
Profit before corporate selling, general, and administrative expenses		$	16,487	$	4,653	$	—	$	21,140
Selling, general, and administrative expenses						11,522		11,522
Depreciation and amortization from SG&A						768		768
Total selling, general, and administrative expenses						$	12,290	$	12,290
Other expense - net						341		341
Operating income								8,509
Interest expense – net						240		240
Income before income taxes								$	8,269

Second Quarter Ended,
June 17, 2017
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	5,868	$	25,964	$	—	$	31,832
	Service revenues	49,225		5,325		—		54,550
Total revenues		$	55,093	$	31,289	$	—	$	86,382
Operating expenses
	Operating costs	36,601		26,669		—		63,270
	Operating depreciation and amortization	1,801		1,535		—		3,336
Profit before corporate selling, general, and administrative expenses		$	16,691	$	3,085	$	—	$	19,776
Selling, general, and administrative expenses						10,575		10,575
Depreciation and amortization from SG&A						848		848
Total selling, general, and administrative expenses						$	11,423	$	11,423
Other (income) - net						(3,027)		(3,027)
Operating income								11,380
Interest expense – net						412		412
Income before income taxes								$	10,968

Segment results for the first half ended June 16, 2018, and June 17, 2017 were as follows:

First Half Ended,
June 16, 2018
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	13,964	$	55,335	$	—	$	69,299
	Service revenues	107,956		6,195		—		114,151
Total revenues		$	121,920	$	61,530	$	—	$	183,450
Operating expenses
	Operating costs	89,181		55,477		—		144,658
	Operating depreciation and amortization	2,992		2,777		—		5,769
Profit before corporate selling, general, and administrative expenses		$	29,747	$	3,276	$	—	$	33,023
Selling, general, and administrative expenses						22,544		22,544
Depreciation and amortization from SG&A						1,533		1,533
Total selling, general, and administrative expenses						$	24,077	$	24,077
Other expense - net						729		729
Operating income								8,217
Interest expense – net						486		486
Income before income taxes								$	7,731

First Half Ended,
June 17, 2017
	(thousands)	Environmental Services		Oil Business		Corporate and Eliminations		Consolidated
Revenues
	Product revenues	$	11,592	$	47,220	$	—	$	58,812
	Service revenues	96,716		11,307		—		108,023
Total revenues		$	108,308	$	58,527	$	—	$	166,835
Operating expenses
	Operating costs	73,121		51,439		—		124,560
	Operating depreciation and amortization	3,547		3,070		—		6,617
Profit before corporate selling, general, and administrative expenses		$	31,640	$	4,018	$	—	$	35,658
Selling, general, and administrative expenses						22,916		22,916
Depreciation and amortization from SG&A						1,699		1,699
Total selling, general, and administrative expenses						$	24,615	$	24,615
Other (income) - net						(8,033)		(8,033)
Operating income								19,076
Interest expense – net						499		499
Income before income taxes								$	18,577

Reconciliation of Assets from Segment to Consolidated

Total assets by segment as of June 16, 2018, and December 30, 2017 were as follows:

(thousands)		June 16, 2018		December 30, 2017
Total Assets:
	Environmental Services	$	142,331	$	131,457
	Oil Business	138,657		129,936
	Unallocated Corporate Assets	52,157		53,264
	Total	$	333,145	$	314,657

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Share-based Compensation (Tables)

6 Months Ended

Jun. 16, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Option Activity

A summary of stock option activity under this Plan is as follows:

Outstanding Stock Options	Number of Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value as of Date Listed (in thousands)
Options outstanding at December 30, 2017	19,435		$	7.33	1.23	$	280
Exercised	(12,440	)	7.33		—	—
Options outstanding at June 16, 2018	6,995		$	7.33	0.77	$	83

Schedule of Restricted Stock Unit Activity

The following table summarizes the restricted stock activity for the first half ended June 16, 2018:

Restricted Stock (Nonvested Shares)	Number of Shares		Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at December 30, 2017	685,999		$	14.52
Granted	480,755		21.81
Vested	(149,710	)	14.57
Nonvested shares outstanding at June 16, 2018	1,017,044		$	18.20

The following table shows a summary of restricted share grants and expense resulting from the awards:

			Compensation Expense
(thousands, except share amounts)			First Half Ended,				Unrecognized Expense as of,
Recipient of Grant	Grant Date	Restricted Shares	June 16, 2018		June 17, 2017		June 16, 2018		December 30, 2017
Members of Management	January, 2016	43,208	$	48	$	48	$	53	$	101
Members of Management	February, 2017	146,564	238		200		603		841
Chief Executive Officer	February, 2017	500,000	716		455		1,707		2,423
Board of Directors	April 2017	14,980	111		37		—		111
Members of Management	February, 2018	116,958	252		479		1,518		1,770
Special Incentive Grant	April, 2018	350,000	353		—		7,715		—
Board of Directors	May, 2018	13,800	44		—		241		—

Schedule of Restricted Stock Vesting Percentages

Vesting Table
Increase in Stock Price From the Employment Commencement Date to the Vesting Date	Total percentage of Restricted Stock Shares to Be Vested
Less than $5 per share increase	—%
$5 per share increase	25%
$10 per share increase	50%
$15 per share increase	75%
$20 or more per share increase	100%

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Earnings Per Share (Tables)

6 Months Ended

Jun. 16, 2018

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

The following table reconciles the number of shares outstanding for the second quarters and the first half of fiscal 2018 and 2017, respectively, to the number of weighted average basic shares outstanding and the number of weighted average diluted shares outstanding for the purposes of calculating basic and diluted earnings per share:

	Second Quarter Ended,				First Half Ended,
(thousands, except share amounts)	June 16, 2018		June 17, 2017		June 16, 2018		June 17, 2017
Net income	$	6,120	$	6,986	$	6,018	$	11,803
Less: Income attributable to noncontrolling interest	121		52		139		105
Net income attributable to Heritage-Crystal Clean, Inc. available to common stockholders	$	5,999	$	6,934	$	5,879	$	11,698
Weighted average basic shares outstanding	23,029		22,506		22,995		22,430
Dilutive shares for share–based compensation plans	332		326		251		299
Weighted average diluted shares outstanding	23,361		22,832		23,246		22,729
Net income per share: basic	$	0.26	$	0.31	$	0.26	$	0.52
Net income per share: diluted	$	0.26	$	0.30	$	0.25	$	0.51

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Organization and Nature of Operations (Details)	6 Months Ended
	Jun. 16, 2018 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2

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Summary of Significant Accounting Policies - Cumulative Effect of the Changes for Topic 606 Adoption (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Statement of Income
Service revenues	$ 60,014	$ 54,550	$ 114,151	$ 108,023
Total revenues	100,303	86,382	183,450	166,835
Operating income	8,509	11,380	8,217	19,076
Income before income taxes	8,269	10,968	7,731	18,577
Provision for income taxes	2,149	3,982	1,713	6,774
Net income	6,120	6,986	6,018	11,803
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	5,999	$ 6,934	5,879	$ 11,698
Balance Sheet
Contract liabilities - net	208		208		$ 0
Total Current Liabilities	50,551		50,551		40,431
Deferred income taxes	11,260		11,260		9,556
Total Liabilities	90,695		90,695		78,731
Retained earnings	46,970		46,970		41,359
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	241,974		241,974		235,228
Total Equity	242,450		242,450		$ 235,926
Balances Without Adoption of Topic 606
Statement of Income
Service revenues	59,985		114,091
Total revenues	100,274		183,390
Operating income	8,480		8,157
Income before income taxes	8,240		7,671
Provision for income taxes	2,141		1,700
Net income	6,099		5,971
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	5,977		5,831
Balance Sheet
Contract liabilities - net	0		0
Total Current Liabilities	50,343		50,343
Deferred income taxes	11,247		11,247
Total Liabilities	90,474		90,474
Retained earnings	47,191		47,191
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	242,195		242,195
Total Equity	242,671		242,671
ASU 2014-09 | Effect of Change Higher/(Lower)
Statement of Income
Service revenues	29		60
Total revenues	29		60
Operating income	29		60
Income before income taxes	29		60
Provision for income taxes	8		13
Net income	21		47
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	22		48
Balance Sheet
Contract liabilities - net	208		208
Total Current Liabilities	208		208
Deferred income taxes	13		13
Total Liabilities	221		221
Retained earnings	(221)		(221)
Total Heritage-Crystal Clean, Inc. Stockholders' Equity	(221)		(221)
Total Equity	$ (221)		$ (221)

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Business Combinations - Narrative (Details) - USD ($) $ in Millions	Jun. 11, 2018	May 03, 2018
PPI
Business Acquisition [Line Items]
Purchase price		$ 5.8
Initial payment		$ 4.2
HTSC
Business Acquisition [Line Items]
Purchase price	$ 0.7
Initial payment	$ 0.3

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Business Combinations - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 34,125		$ 31,580	$ 31,483
Net cash paid	4,505	$ 0
PPI
Business Acquisition [Line Items]
Accounts receivable	909
Inventory	259
Property, plant, & equipment	1,969
Intangible assets	528
Equipment at customers	0
Goodwill	2,172
Less: contingent consideration	(1,450)
Total purchase price, net of cash acquired	5,837
Less: to be placed into escrow	(187)
Less: deferred consideration	0
Net cash paid	4,200
HTSC
Business Acquisition [Line Items]
Accounts receivable	48
Inventory	3
Property, plant, & equipment	47
Intangible assets	100
Equipment at customers	104
Goodwill	377
Less: contingent consideration	(100)
Total purchase price, net of cash acquired	679
Less: to be placed into escrow	(49)
Less: deferred consideration	(225)
Net cash paid	$ 305

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Revenue - Schedule of Disaggregation of Revenue by Major Lines (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017
Revenue from Contract with Customer [Abstract]
Payment term			30 days
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 100,185		$ 183,240
Other Revenue	118		210
Total revenues	100,303	$ 86,382	183,450	$ 166,835
Parts cleaning, containerized waste, & related products/services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	41,513		81,108
Vacuum Services & Wastewater Treatment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	12,460		24,307
Antifreeze Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	4,003		7,462
Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,068		8,222
Environmental Services - Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	401		821
Re-refinery Product Sales
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	29,413		49,898
Oil Collection Services & RFO
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	5,096		9,113
Oil Filter Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,231		2,309
Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	64,445		121,920
Other Revenue	0		0
Total revenues	64,445		121,920
Environmental Services | Parts cleaning, containerized waste, & related products/services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	41,513		81,108
Environmental Services | Vacuum Services & Wastewater Treatment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	12,460		24,307
Environmental Services | Antifreeze Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	4,003		7,462
Environmental Services | Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,068		8,222
Environmental Services | Environmental Services - Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	401		821
Environmental Services | Re-refinery Product Sales
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Environmental Services | Oil Collection Services & RFO
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Environmental Services | Oil Filter Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	35,740		61,320
Other Revenue	118		210
Total revenues	35,858		61,530
Oil Business | Parts cleaning, containerized waste, & related products/services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Oil Business | Vacuum Services & Wastewater Treatment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Oil Business | Antifreeze Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Oil Business | Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Oil Business | Environmental Services - Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Oil Business | Re-refinery Product Sales
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	29,413		49,898
Oil Business | Oil Collection Services & RFO
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	5,096		9,113
Oil Business | Oil Filter Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 1,231		$ 2,309

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Revenue - Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 16, 2018	Jun. 16, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract assets	$ 71	$ 71	$ 59
Contract liabilities	279	279	327
Contract liabilities - net	208	208	$ 268
Revenue recognized previously included in contract liabilities	$ 16	$ 300

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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 16, 2018	Dec. 30, 2017	Dec. 31, 2016
Accounts Receivable, Net [Abstract]
Trade	$ 50,675	$ 43,301
Less: allowance for doubtful accounts	(1,826)	(1,881)	$ (2,176)
Trade - net	48,849	41,420
Related parties	2,045	1,906
Other	3,013	2,165
Total accounts receivable - net	$ 53,907	$ 45,491

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Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,881	$ 2,176	$ 2,176
Provision for bad debts	352	$ (6)	402
Accounts written off, net of recoveries	(407)		(697)
Balance at end of period	$ 1,826		$ 1,881

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Inventory (Details) - USD ($)	6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Inventory Disclosure [Abstract]
Used oil and processed oil	$ 8,989,000		$ 5,788,000
Solvents and solutions	6,912,000		6,201,000
Drums and supplies	4,773,000		4,430,000
Machines	4,296,000		3,679,000
Other	2,255,000		1,936,000
Total inventory	27,225,000		22,034,000
Less: machine refurbishing reserve	(294,000)		(395,000)
Total inventory - net	26,931,000		$ 21,639,000
Inventory write-down	$ 0	$ 0

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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Property, Plant and Equipment [Abstract]
Machinery, vehicles, and equipment	$ 87,711		$ 87,711		$ 85,427
Buildings and storage tanks	69,273		69,273		69,009
Land	9,552		9,552		9,562
Leasehold improvements	5,581		5,581		5,427
Construction in progress	13,787		13,787		9,378
Assets held for sale	53		53		53
Total property, plant and equipment	185,957		185,957		178,856
Less: accumulated depreciation	(54,402)		(54,402)		(50,737)
Property, plant and equipment - net	131,555		131,555		128,119
Equipment at customers	70,770		70,770		68,234
Less: accumulated depreciation	(46,919)		(46,919)		(44,922)
Equipment at customers - net	23,851		23,851		$ 23,312
Depreciation expense	$ 2,900	$ 3,400	$ 5,900	$ 6,800

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Goodwill and Other Intangible Assets - Goodwill (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 16, 2018 USD ($) reporting_unit	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units | reporting_unit	2
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 38,077	$ 35,532	$ 35,435
Accumulated impairment loss	(3,952)	(3,952)	(3,952)
Goodwill [Roll Forward]
Net book value, beginning balance	31,580	31,483
Measurement period adjustments	2,545	97
Net book value, ending balance	34,125	31,580
Oil Business
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,952	3,952	3,952
Accumulated impairment loss	(3,952)	(3,952)	(3,952)
Goodwill [Roll Forward]
Net book value, beginning balance	0	0
Measurement period adjustments	0	0
Net book value, ending balance	0	0
Environmental Services
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34,125	31,580	31,483
Accumulated impairment loss	0	0	$ 0
Goodwill [Roll Forward]
Net book value, beginning balance	31,580	31,483
Measurement period adjustments	2,545	97
Net book value, ending balance	$ 34,125	$ 31,580

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Goodwill and Other Intangible Assets - Summary of Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 34,477		$ 34,477		$ 33,867
Accumulated Amortization	18,572		18,572		17,135
Net Carrying Amount	15,905		15,905		16,732
Amortization of intangible assets	700	$ 800	1,400	$ 1,500
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2018	1,600		1,600
2019	2,800		2,800
2020	2,600		2,600
2021	2,400		2,400
2022	2,300		2,300
Customer & supplier relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23,694		23,694		23,077
Accumulated Amortization	10,117		10,117		9,027
Net Carrying Amount	13,577		$ 13,577		14,050
Useful life			10 years
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,724		$ 4,724		4,724
Accumulated Amortization	4,006		4,006		3,899
Net Carrying Amount	718		$ 718		825
Useful life			9 years
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,942		$ 2,942		2,949
Accumulated Amortization	2,786		2,786		2,617
Net Carrying Amount	156		$ 156		332
Useful life			5 years
Patents, formulae, and licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,769		$ 1,769		1,769
Accumulated Amortization	672		672		642
Net Carrying Amount	1,097		$ 1,097		1,127
Useful life			15 years
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,348		$ 1,348		1,348
Accumulated Amortization	991		991		950
Net Carrying Amount	$ 357		$ 357		$ 398
Useful life			6 years

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Accounts Payable (Details) - USD ($) $ in Thousands	Jun. 16, 2018	Dec. 30, 2017
Payables and Accruals [Abstract]
Accounts payable	$ 34,649	$ 25,540
Accounts payable - related parties	517	28
Total accounts payable	$ 35,166	$ 25,568

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Debt and Financing Arrangements - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 21, 2017	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs		$ 100,000
Interest costs capitalized		$ 0
Weighted average interest rate		3.60%	3.80%	3.60%	3.80%
Letters of credit outstanding		$ 1,500,000		$ 1,500,000		$ 900,000
Current borrowing capacity		63,500,000		63,500,000		$ 64,100,000
Term Loan
Debt Instrument [Line Items]
Interest costs incurred		$ 300,000	$ 400,000	$ 700,000	$ 900,000
Credit Agreement
Debt Instrument [Line Items]
Minimum interest coverage ratio	3.5
Maximum total leverage ratio	3.0
Aggregate consideration limit	$ 10,000,000.0
Leverage ratio at time of acquisition	3.25
Capital expenditures covenant limit	$ 100,000,000.0
Percentage of EBITDA	35.00%
Credit Agreement | Bank Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 95,000,000.0
Credit Agreement | Bank Credit Facility | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Credit Agreement | Bank Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Credit Agreement | Bank Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Credit Agreement | Bank Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
Credit Agreement | Bank Credit Facility | Bank of America's Prime Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Credit Agreement | Bank Credit Facility | Bank of America's Prime Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Credit Agreement | Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30,000,000.0
Credit Agreement | Revolving Loan Portion
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 65,000,000.0

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Debt and Financing Arrangements - Summary of Debt (Details) - USD ($) $ in Thousands	Jun. 16, 2018	Dec. 30, 2017
Debt Disclosure [Abstract]
Principal amount	$ 30,000	$ 30,000
Less: unamortized debt issuance costs	1,116	1,256
Debt less unamortized debt issuance costs	$ 28,884	$ 28,744

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Segment Information - Operating Segment Results (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018 USD ($)	Jun. 17, 2017 USD ($)	Jun. 16, 2018 USD ($) segment	Jun. 17, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Revenues
Product revenues	$ 40,289	$ 31,832	$ 69,299	$ 58,812
Service revenues	60,014	54,550	114,151	108,023
Total revenues	100,303	86,382	183,450	166,835
Operating expenses
Operating costs	76,272	63,270	144,658	124,560
Operating depreciation and amortization	2,891	3,336	5,769	6,617
Profit before corporate selling, general, and administrative expenses	21,140	19,776	33,023	35,658
Selling, general, and administrative expenses	11,522	10,575	22,544	22,916
Depreciation and amortization from SG&A	768	848	1,533	1,699
Total selling, general, and administrative expenses	12,290	11,423	24,077	24,615
Other expense (income) - net	341	(3,027)	729	(8,033)
Operating income	8,509	11,380	8,217	19,076
Interest expense – net	240	412	486	499
Income before income taxes	8,269	10,968	7,731	18,577
Segments
Operating expenses
Operating depreciation and amortization
Corporate and Eliminations
Revenues
Product revenues	0	0	0	0
Service revenues	0	0	0	0
Total revenues	0	0	0	0
Operating expenses
Operating costs	0	0	0	0
Operating depreciation and amortization	0	0	0	0
Profit before corporate selling, general, and administrative expenses	0	0	0	0
Selling, general, and administrative expenses	11,522	10,575	22,544	22,916
Depreciation and amortization from SG&A	768	848	1,533	1,699
Total selling, general, and administrative expenses	12,290	11,423	24,077	24,615
Other expense (income) - net	341	(3,027)	729	(8,033)
Interest expense – net	240	412	486	499
Environmental Services
Revenues
Total revenues	64,445		121,920
Environmental Services | Segments
Revenues
Product revenues	7,521	5,868	13,964	11,592
Service revenues	56,924	49,225	107,956	96,716
Total revenues	64,445	55,093	121,920	108,308
Operating expenses
Operating costs	46,456	36,601	89,181	73,121
Operating depreciation and amortization	1,502	1,801	2,992	3,547
Profit before corporate selling, general, and administrative expenses	16,487	16,691	29,747	31,640
Oil Business
Revenues
Total revenues	35,858		61,530
Oil Business | Segments
Revenues
Product revenues	32,768	25,964	55,335	47,220
Service revenues	3,090	5,325	6,195	11,307
Total revenues	35,858	31,289	61,530	58,527
Operating expenses
Operating costs	29,816	26,669	55,477	51,439
Operating depreciation and amortization	1,389	1,535	2,777	3,070
Profit before corporate selling, general, and administrative expenses	$ 4,653	$ 3,085	$ 3,276	$ 4,018

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Segment Information - Assets by Segment (Details) - USD ($) $ in Thousands	Jun. 16, 2018	Dec. 30, 2017
Segment Reporting Information [Line Items]
Assets	$ 333,145	$ 314,657
Segments | Environmental Services
Segment Reporting Information [Line Items]
Assets	142,331	131,457
Segments | Oil Business
Segment Reporting Information [Line Items]
Assets	138,657	129,936
Unallocated Corporate Assets
Segment Reporting Information [Line Items]
Assets	$ 52,157	$ 53,264

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Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 16, 2018	Dec. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Remaining amount committed	$ 21.4	$ 15.6
Loss contingency accrual	$ 4.6	$ 4.5

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Operating Loss Carryforwards [Line Items]
Deferred tax asset, state and federal NOL	$ 4.8		$ 4.8
Effective tax rate	26.00%	36.30%	22.20%	36.50%
Reserve balance	$ 2.5		$ 2.5		$ 2.5
Tax years 2011 - 2017
Operating Loss Carryforwards [Line Items]
Net operating loss	44.7		44.7
Tax year 2011
Operating Loss Carryforwards [Line Items]
Net operating loss	6.3		6.3
Tax years 2012 - 2015
Operating Loss Carryforwards [Line Items]
Net operating loss	13.0		13.0
Tax years 2011 - 2015
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 19.3		$ 19.3

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Share-based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 16, 2018	Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares authorized	2,602,077
Number of shares available for grant	180,150
Number of Options Outstanding
Options outstanding at Beginning of Period (in shares)	19,435
Exercised (in shares)	(12,440)
Options outstanding at End of Period (in shares)	6,995	19,435
Weighted Average Exercise Price
Options outstanding at Beginning of Period (in dollars per share)	$ 7.33
Exercised (in dollars per share)	7.33
Options outstanding at End of Period (in dollars per share)	$ 7.33	$ 7.33
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value as of Date Listed
Weighted average remaining contractual term (in years)	9 months 7 days	1 year 2 months 23 days
Aggregate intrinsic value as of date listed	$ 83	$ 280

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Share-based Compensation - Restricted Stock Compensation/Awards (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	6 Months Ended
	Apr. 13, 2018	Mar. 14, 2018	Feb. 28, 2017	Jun. 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)				480,755
Number of shares available for grant				180,150
Vested (in shares)				149,710
Mr. Recatto
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing share price as of employment commencement date (in dollars per share)			$ 15.00
Restricted stock | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				1 year
Restricted stock | Members of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				3 years
Restricted stock | Members of Management | Omnibus Incentive Plan of 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	612,500
Grants in period (in shares)	350,000
Restricted stock | Members of Management | Omnibus Incentive Plan of 2008 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares expected to vested	0
Restricted stock | Members of Management | Omnibus Incentive Plan of 2008 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares expected to vested	612,500
Restricted stock | Mr. Recatto
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			500,000
Vesting threshold (in dollars per share)			$ 5.00
Shares vested upon achievement of share price threshold (in shares)			0
Compensation Expense				$ 0.7
Accelerated vesting compensation expense				$ 0.2
Unrecognized compensation expense			$ 1.7
Risk-free rate			1.70%
Expected dividend yield			0.00%
Expected volatility rate			41.73%
Restricted stock | Mr. Recatto | Less than $5 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				180 days
Vesting percentage			0.00%	50.00%
Restricted stock | Mr. Recatto | $5 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%	25.00%
Vested (in shares)		125,000

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Share-based Compensation - Schedule of Restricted Stock Unit Activity (Details) - USD ($) $ in Thousands	1 Months Ended				6 Months Ended
	Apr. 30, 2018	Feb. 28, 2018	Feb. 28, 2017	Jan. 31, 2016	Jun. 16, 2018	Jun. 17, 2017	Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)					480,755
April, 2018 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	350,000
Compensation Expense					$ 353	$ 0
Unrecognized compensation expense					7,715		$ 0
Members of Management | January, 2016 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)				43,208
Compensation Expense					48	48
Unrecognized compensation expense					53		101
Members of Management | February, 2017 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)			146,564
Compensation Expense					238	200
Unrecognized compensation expense					603		841
Members of Management | February, 2018 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)		116,958
Compensation Expense					252	479
Unrecognized compensation expense					1,518		1,770
Chief Executive Officer | February, 2017 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)			500,000
Compensation Expense					716	455
Unrecognized compensation expense					1,707		2,423
Board of Directors | April 2017 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)			14,980
Compensation Expense					111	37
Unrecognized compensation expense					0		111
Board of Directors | May, 2018 | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	13,800
Compensation Expense					44	$ 0
Unrecognized compensation expense					$ 241		$ 0

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Share-based Compensation - Restricted Stock Vesting Schedule by Percentage (Details) - Mr. Recatto - Restricted stock - $ / shares		1 Months Ended	6 Months Ended
	Mar. 14, 2018	Feb. 28, 2017	Jun. 16, 2018
Less than $5 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share)		$ 5
Total percentage of Restricted Stock Shares to Be Vested		0.00%	50.00%
$5 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share)		$ 5
Total percentage of Restricted Stock Shares to Be Vested	25.00%	25.00%
$10 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share)		$ 10
Total percentage of Restricted Stock Shares to Be Vested		50.00%
$15 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share)		$ 15
Total percentage of Restricted Stock Shares to Be Vested		75.00%
$20 or more per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share)		$ 20
Total percentage of Restricted Stock Shares to Be Vested		100.00%

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Share-based Compensation - Nonvested Restricted Stock (Details)	6 Months Ended
	Jun. 16, 2018 $ / shares shares
Number of Shares
Nonvested shares outstanding at Beginning of Period (in shares) | shares	685,999
Granted (in shares) | shares	480,755
Vested (in shares) | shares	(149,710)
Nonvested shares outstanding at End of Period (in shares) | shares	1,017,044
Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at Beginning of Period (in dollars per share) | $ / shares	$ 14.52
Granted (in dollars per share) | $ / shares	21.81
Vested (in dollars per share) | $ / shares	14.57
Nonvested shares outstanding at End of Period (in dollars per share) | $ / shares	$ 18.20

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Share-based Compensation - Employee Stock Purchase Plan (Details)	6 Months Ended
	Jun. 16, 2018 $ / shares shares
Common stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Issuance of common stock – ESPP (in shares)	9,641
Employee Stock Purchase Plan of 2008 | Employee stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares available employee stock purchase plan (in shares)	140,385
Weighted average fair value per share ESPP (in dollars per share) | $ / shares	$ 22.32

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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Jun. 16, 2018	Jun. 17, 2017
Earnings Per Share [Abstract]
Net income	$ 6,120	$ 6,986	$ 6,018	$ 11,803
Less: Income attributable to noncontrolling interest	121	52	139	105
Net income attributable to Heritage-Crystal Clean, Inc. common stockholders	$ 5,999	$ 6,934	$ 5,879	$ 11,698
Weighted average basic shares outstanding (in shares)	23,029	22,506	22,995	22,430
Dilutive shares from share–based compensation plans (in shares)	332	326		299
Weighted average diluted shares outstanding (in shares)	23,361	22,832	23,246	22,729
Net income per share: basic (in dollars per share)	$ 0.26	$ 0.31	$ 0.26	$ 0.52
Net income per share: diluted (in dollars per share)	$ 0.26	$ 0.30	$ 0.25	$ 0.51

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Other Expense (Income) - Net (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 16, 2018	Jun. 17, 2017	Mar. 25, 2017	Jun. 16, 2018	Jun. 17, 2017
Restructuring Cost and Reserve [Line Items]
Other expense (income)	$ 341	$ (3,027)		$ 729	$ (8,033)
Award or settlement
Restructuring Cost and Reserve [Line Items]
Other expense (income)		$ 3,600	$ 5,100
Facility closing
Restructuring Cost and Reserve [Line Items]
Other expense (income)				$ 500