Investment in Unconsolidated Affiliates - Summary of Financial Information (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Nov. 30, 2015	Nov. 30, 2016	Dec. 31, 2014
Summary statement of operations information:
Current assets	$ 69,103	$ 35,407
Current liabilities	5,065	26,605
SG2 Holdings, North Star Holdings, Lost Hills Blackwell Holdings and Henrietta Holdings
Summary statement of operations information:
Revenue	55,227	72,099	$ 1,722
Operating expenses	37,342	47,385	3,367
Net income (loss)	18,187	24,970	$ (1,583)
Current assets	35,002	45,086
Long-term assets	1,114,854	1,498,820
Current liabilities	8,035	6,250
Long-term liabilities	$ 9,200	$ 12,329