Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The Company has disclosed a summary of the Company's significant accounting policies in its Annual Report on Form 10-K for the year ended December 31, 2015. There have been no material changes from the policies previously disclosed other than those noted below. Accounts Receivable Accounts receivable are carried at invoiced amount less allowance for doubtful accounts. Management estimates the allowance for doubtful accounts based on existing economic conditions, the financial conditions of customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after reasonable collection attempts have been exhausted. Through June 30, 2016, the Company received approximately $242,139 related to the 2015 biodiesel mixture excise tax credit, which results in $1,650 remaining as outstanding receivables at June 30, 2016. Property, Plant and Equipment Property, plant and equipment is recorded at cost less accumulated depreciation. Maintenance and repairs are expensed as incurred. Depreciation expense is computed on a straight-line method based upon estimated useful lives of the assets. In April 2015, the Company experienced a fire at its Geismar facility, resulting in the shutdown of the facility. The Company estimated fixed assets with a net book value of approximately $11,027 were impaired as a result of the fire. At June 30, 2016, the Company has received property insurance proceeds of $17,600, of which $15,567 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $997 and$4,540, was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three and six months ended June 30, 2016, respectively. In September 2015, another fire occurred at the Geismar facility. The Company estimated fixed assets with a net book value of approximately $1,414 were impaired by the September fire. The Company believes it is probable that it will recover all the net book value of the assets damaged by the fire under its insurance policies. As such, a receivable was recorded as an offset to the estimated impairment loss. No impact on earnings was recognized. Goodwill Goodwill is tested for impairment annually on July 31 or when impairment indicators exist. Goodwill is allocated and tested for impairment by reporting units. At June 30, 2016 and December 31, 2015, the Company had goodwill in the Services reporting unit. The annual impairment test at July 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by approximately 21%. The interim goodwill impairment test as of October 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by 24%. There have been no impairment indicators in the first six months of 2016 that would indicate an additional assessment should be performed. Convertible Debt In June 2016, the Company issued $152,000 aggregate principal amount of 4% convertible senior notes due 2036 (the "2036 Convertible Notes"). The Company may not elect to issue shares of common stock upon conversion of the 2036 Convertible Notes to the extent such election would result in the issuance of more than 19.99% of the common stock outstanding immediately before the issuance of the 2036 Convertible Notes until the Company receives stockholder approval for such issuance. As a result, the embedded conversion option is accounted for as an embedded derivative liability. This liability is recorded at fair value, and a $13,432 fair value adjustment was recorded in the second quarter of 2016. The Company expects to continue marking the embedded conversion option to market until shareholders authorize additional common shares at its Annual Shareholder Meeting in May 2017. See "Note 7 - Debt" for a further description of the transaction. Share Repurchase Programs In February 2015, the Company's board of directors approved a share repurchase program of up to $30,000 of the Company's shares of common stock. Shares may be repurchased from time to time in open market transactions, privately negotiated transactions or by other means. The Company accounts for share repurchases using the cost method. Under this method, the cost of the share repurchase is recorded entirely in treasury stock, a contra equity account. During the three months ended June 30, 2016, the Company used all of the remaining available funds of approximately $870 authorized under this program to repurchase 90,654 shares, resulting in total repurchases in the amount of $6,687 for the six months ended June 30, 2016 under this share repurchase program. In March 2016, the Company's board of directors approved a repurchase program of up to $50,000 of the Company's shares of common stock and/or convertible notes, in effect through March 5, 2018. Under the program, which is in addition to the $30,000 common stock repurchase program announced in February 2015, the Company may repurchase shares or convertible notes from time to time in open market transactions, privately negotiated transactions or by other means. The timing and amount of repurchase transactions will be determined by the Company's management based on its evaluation of market conditions, share price, bond price, legal requirements and other factors. During the three and six months ended June 30, 2016, the Company repurchased 4,442,823 shares of Common Stock for $38,429 under this program. New Accounting Standards In March 2016, the FASB issued ASU 2016-08, "Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net)" that clarifies how an entity should identify the unit of accounting for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements, such as service transactions. The guidance also re-frames the indicators to focus on evidence that an entity is acting as a principal rather than an agent. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is evaluating the impact this guidance will have on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting”. The amendments in this updated guidance include changes to simplify the codification for several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. For public entities, this guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is permitted. The Company is evaluating the impact this new guidance will have on its consolidated financial statements. In May 2016, the FASB issued ASU 2016-12, which amends certain aspects of the new revenue standard, ASU 2014-09. The amendments address issues such as collectability; presentation of sales tax and other similar taxes collected from customers; noncash consideration; contract modifications and completed contracts at transition; and transition technical correction. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The Company is evaluating the impact this guidance will have on its consolidated financial statements.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The Company has disclosed a summary of the Company's significant accounting policies in its Annual Report on Form 10-K for the year ended December 31, 2015. There have been no material changes from the policies previously disclosed other than those noted below.

Accounts Receivable

Accounts receivable are carried at invoiced amount less allowance for doubtful accounts. Management estimates the allowance for doubtful accounts based on existing economic conditions, the financial conditions of customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after reasonable collection attempts have been exhausted. Through June 30, 2016, the Company received approximately $242,139 related to the 2015 biodiesel mixture excise tax credit, which results in $1,650 remaining as outstanding receivables at June 30, 2016.

Property, Plant and Equipment

Property, plant and equipment is recorded at cost less accumulated depreciation. Maintenance and repairs are expensed as incurred. Depreciation expense is computed on a straight-line method based upon estimated useful lives of the assets.

In April 2015, the Company experienced a fire at its Geismar facility, resulting in the shutdown of the facility. The Company estimated fixed assets with a net book value of approximately $11,027 were impaired as a result of the fire. At June 30, 2016, the Company has received property insurance proceeds of $17,600, of which $15,567 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $997 and$4,540, was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three and six months ended June 30, 2016, respectively.

In September 2015, another fire occurred at the Geismar facility. The Company estimated fixed assets with a net book value of approximately $1,414 were impaired by the September fire. The Company believes it is probable that it will recover all the net book value of the assets damaged by the fire under its insurance policies. As such, a receivable was recorded as an offset to the estimated impairment loss. No impact on earnings was recognized.

Goodwill

Goodwill is tested for impairment annually on July 31 or when impairment indicators exist. Goodwill is allocated and

tested for impairment by reporting units. At June 30, 2016 and December 31, 2015, the Company had goodwill in the Services reporting unit. The annual impairment test at July 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by approximately 21%. The interim goodwill impairment test as of October 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by 24%. There have been no impairment indicators in the first six months of 2016 that would indicate an additional assessment should be performed.

Convertible Debt

In June 2016, the Company issued $152,000 aggregate principal amount of 4% convertible senior notes due 2036 (the "2036 Convertible Notes"). The Company may not elect to issue shares of common stock upon conversion of the 2036 Convertible Notes to the extent such election would result in the issuance of more than 19.99% of the common stock outstanding immediately before the issuance of the 2036 Convertible Notes until the Company receives stockholder approval for such issuance. As a result, the embedded conversion option is accounted for as an embedded derivative liability. This liability is recorded at fair value, and a $13,432 fair value adjustment was recorded in the second quarter of 2016. The Company expects to continue marking the embedded conversion option to market until shareholders authorize additional common shares at its Annual Shareholder Meeting in May 2017. See "Note 7 - Debt" for a further description of the transaction.

Share Repurchase Programs

In February 2015, the Company's board of directors approved a share repurchase program of up to $30,000 of the Company's shares of common stock. Shares may be repurchased from time to time in open market transactions, privately negotiated transactions or by other means. The Company accounts for share repurchases using the cost method. Under this method, the cost of the share repurchase is recorded entirely in treasury stock, a contra equity account. During the three months ended June 30, 2016, the Company used all of the remaining available funds of approximately $870 authorized under this program to repurchase 90,654 shares, resulting in total repurchases in the amount of $6,687 for the six months ended June 30, 2016 under this share repurchase program.

In March 2016, the Company's board of directors approved a repurchase program of up to $50,000 of the Company's

shares of common stock and/or convertible notes, in effect through March 5, 2018. Under the program, which is in addition to the $30,000 common stock repurchase program announced in February 2015, the Company may repurchase shares or convertible notes from time to time in open market transactions, privately negotiated transactions or by other means. The timing and amount of repurchase transactions will be determined by the Company's management based on its evaluation of market conditions, share price, bond price, legal requirements and other factors. During the three and six months ended June 30, 2016, the Company repurchased 4,442,823 shares of Common Stock for $38,429 under this program.

New Accounting Standards

In March 2016, the FASB issued ASU 2016-08, "Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net)" that clarifies how an entity should identify the unit of accounting for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements, such as service transactions. The guidance also re-frames the indicators to focus on evidence that an entity is acting as a principal rather than an agent. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is evaluating the impact this guidance will have on its consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting”. The amendments in this updated guidance include changes to simplify the codification for several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. For public entities, this guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is permitted. The Company is evaluating the impact this new guidance will have on its consolidated financial statements.

In May 2016, the FASB issued ASU 2016-12, which amends certain aspects of the new revenue standard, ASU 2014-09. The amendments address issues such as collectability; presentation of sales tax and other similar taxes collected from customers; noncash consideration; contract modifications and completed contracts at transition; and transition technical correction. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The Company is evaluating the impact this guidance will have on its consolidated financial statements.