Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2016
Accounting Policies [Abstract]
Accounts Receivable	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. At March 31, 2016, over $231,000 of the receivable amounts outstanding at December 31, 2015 related to the 2015 biodiesel mixture excise tax credit reinstatement were received.
Property, Plant and Equipment	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. As of the date of this report, the Company has received property insurance proceeds of $14,570, of which $11,027 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $3,543, was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three months ended March 31, 2016. 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 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 March 31, 2016 and December 31, 2015, the Company had goodwill in only one of its reporting units: Services. 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 three months of 2016 that would indicate an additional assessment needs to be performed.
Share Repurchase Programs	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. The program is in effect through October 31, 2016. 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 March 31, 2016, the Company repurchased shares of Common Stock in the amount of $5,817, of which $944 was paid after March 31, 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 bonds 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. No shares or convertible notes were repurchased under this program during the three months ended March 31, 2016.
New Accounting Standards	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.

Disclosure of accounting policy for trade and other accounts receivables. This disclosure may include the basis at which such receivables are carried in the entity's statements of financial position (for example, net realizable value), how the entity determines the level of its allowance for doubtful accounts, when impairments, charge-offs or recoveries are recognized, and the entity's income recognition policies for such receivables, including its treatment of related fees and costs, its treatment of premiums, discounts or unearned income, when accrual of interest is discontinued, how the entity records payments received on nonaccrual receivables and its policy for resuming accrual of interest on such receivables. If the enterprise holds a large number of similar loans, disclosure may include the accounting policy for the anticipation of prepayments and significant assumptions underlying prepayment estimates for amortization of premiums, discounts, and nonrefundable fees and costs.