Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenues:		$ 394,856	$ 384,258	$ 999,536	$ 936,216
Income (loss) before income taxes:		(16,721)	4,324	(58,792)	946
Depreciation and amortization expense, net:		6,417	3,899	18,377	9,938
Cash paid for purchases of property, plant and equipment:		33,307	13,269	61,014	45,579
Assets:		1,172,227		1,172,227		$ 1,372,888
Intersegment revenues
Segment Reporting Information [Line Items]
Net revenues:		(31,129)	(25,290)	(81,460)	(71,793)
Corporate and other
Segment Reporting Information [Line Items]
Income (loss) before income taxes:	[1]	(17,599)	(18,391)	(51,898)	(48,484)
Depreciation and amortization expense, net:	[1]	653	335	1,973	856
Cash paid for purchases of property, plant and equipment:	[1]	1,124	3,508	2,161	4,281
Assets:	[2]	199,080		199,080		452,927
Biomass-based diesel | Segments
Segment Reporting Information [Line Items]
Net revenues:		394,824	384,126	999,371	935,997
Income (loss) before income taxes:		873	22,603	(6,948)	49,278
Depreciation and amortization expense, net:		5,685	3,509	16,187	8,934
Cash paid for purchases of property, plant and equipment:		31,953	9,749	57,498	40,655
Assets:		951,207		951,207		899,211
Services | Segments
Segment Reporting Information [Line Items]
Net revenues:		31,161	25,422	81,625	72,012
Income (loss) before income taxes:		5	112	54	152
Depreciation and amortization expense, net:		79	55	217	148
Cash paid for purchases of property, plant and equipment:		230	$ 12	1,355	$ 643
Assets:		$ 21,940		$ 21,940		$ 20,750

[1] Corporate and other includes income/(expense) not associated with the reportable segments, such as corporate general and administrative expenses, shared service expenses, interest expense and interest income.

[2] Corporate and other includes cash and other assets not associated with the reportable segments, including investments.