Commitments and Contingencies Commitments and Contingencies Details 1 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 1,163	$ 1,150	$ 1,236
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year	273,508
Purchase Obligation, Due in Second Year	170,252
Purchase Obligation, Due in Third Year	258,130
Purchase Obligation, Due in Fourth Year	293,267
Purchase Obligation, Due in Fifth Year	214,401
Purchase Obligation, Due after Fifth Year	138,278
Purchase Obligation	$ 1,347,836