Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash	$ 9,581	$ 6,900
Trade accounts receivable	47,706	60,742
Receivable from affiliates	828	894
Costs and estimated earnings in excess of billings	90,375	86,710
Inventory	22,306	25,797
Prepaid expenses and other current assets	3,946	5,133
Total current assets	174,742	186,176
Property and equipment:
Plant, machinery and equipment	73,482	74,896
Structural fill site improvements	55,760	55,760
Vehicles	19,726	17,407
Office equipment	2,322	1,623
Buildings and leasehold improvements	262	262
Structural fill sites	7,110	7,110
Construction in progress	9,596	3,488
Total property and equipment	168,258	160,546
Less accumulated depreciation	(80,969)	(71,605)
Property and equipment, net	87,289	88,941
Other assets:
Trade names, net	34,850	34,920
Other intangible assets, net	0	22
Goodwill	74,213	74,213
Other assets	0	891
Deferred tax asset	9,136	2,747
Equity method investments	5,218	5,060
Total assets	447,260	458,901
Current liabilities:
Accounts payable	29,273	24,821
Billings in excess of costs and estimated earnings	160	1,352
Notes payable, current maturities	108,722	23,268
Accrued payroll and bonuses	11,588	15,480
Asset retirement obligation, current portion	14,126	14,704
Purchase option liability	7,110	10,017
Accrued expenses	20,628	22,473
Other liabilities	905	0
Total current liabilities	192,512	112,115
Long-term liabilities:
Contingent payments for acquisitions	11,349	11,214
Asset retirement obligation, less current portion	6,819	11,361
Line of credit	35,174	19,799
Notes payable, less current maturities	127,837	211,022
Total liabilities	373,691	365,511
Commitments and contingencies (see Note 11)
Stockholders’ equity:
Retained (losses) earnings	(11,431)	9,414
Common Stock, $0.01 par value; 200,000,000 shares authorized; 29,586,165 and 29,082,988 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	296	291
Additional paid-in capital	83,681	82,880
Total stockholders’ equity	72,546	92,585
Non-controlling interest	1,023	805
Total equity	73,569	93,390
Total liabilities and equity	447,260	458,901
Customer relationships
Other assets:
Finite lived intangible assets, net	59,951	63,898
Technology
Other assets:
Finite lived intangible assets, net	1,753	1,853
Non-compete and other agreements
Other assets:
Finite lived intangible assets, net	$ 108	$ 180