Equity Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Revenues	$ 14,791	$ 23,284	$ 32,943
Operating income (loss)	(448,138)	411	10,058
Net income (loss)	(448,138)	411	$ 10,058
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract] [Abstract]
Current assets	3,181	7,898
Non-current assets	70,812	475,789
Current liabilities	180	50
Non-current liabilities	$ 62,951	$ 5,237