Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Property, plant and equipment, net	$ 354,285	$ 356,230
Total assets	575,771	620,708
Liabilities and members' equity:
Total current portion of long term debt	17,023	62,023
Total long term debt	58,009	86,819
Total liabilities and member's equity	476,238	451,551
Diamond Green Diesel Holdings LLC Joint Venture [Member]
ASSETS
Total current assets	207,392	261,444
Other assets	14,094	3,034
Liabilities and members' equity:
Total other current liabilities	24,093	19,935
Total other long term liabilities	408	380
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$ 575,771	$ 620,708