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Equity Method Investments - The Company's Equity in Earnings (Loss) of Joint Ventures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Equity in earnings (loss) of joint ventures $ 1,079 $ 3,096 $ 1,596 $ 4,448
ICP [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity in earnings (loss) of joint ventures 1,079 3,229 1,596 4,558
DMI [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity in earnings (loss) of joint ventures $ 0 $ (133) $ 0 $ (110)