Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	$ 22,576
2017	10,858
2018	500
Total	33,934
Annual fixed fees incurred	$ 12,800	$ 9,300	$ 12,800