Investment in Unconsolidated Subsidiary Selected Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Property, plant and equipment, net	$ 356,230	$ 373,117
Total assets	620,708	592,200
Liabilities and members' equity:
Total current portion of long term debt	62,023	57,514
Total long term debt	86,819	155,273
Total members' equity	451,551	357,761
Expenses:
Operating income	157,274	145,091	$ 24,336
Interest and debt expense, net	(13,604)	(17,640)	(9,049)
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Assets:
Total current assets	261,444	216,991
Other assets	3,034	2,092
Liabilities and members' equity:
Total other current liabilities	19,935	21,313
Total other long term liabilities	380	339
Total liabilities and member's equity	620,708	592,200
Revenues:
Operating revenues	475,934	487,834	213,552
Expenses:
Total costs and expenses	318,660	342,743	189,216
Other income	120	82	33
Net income	$ 143,790	$ 127,533	$ 15,320