Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Obligation	$ 1,983,967	[1]
Purchase Obligation, Due in Next Twelve Months	705,387
Purchase Obligation, Due in Second and Third Year	621,937
Purchase Obligation, Due in Fourth and Fifth Year	186,377
Purchase Obligation, Due after Fifth Year	470,266
Other Commitment	160,024	[2]
Other Commitment, Due in Next Twelve Months	160,024	[2]
Other Commitment, Due in Second and Third Year	0	[2]
Other Commitment, Due in Fourth and Fifth Year	0	[2]
Other Commitment, Due after Fifth Year	0	[2]
Contractual Obligation, Total	2,143,991
Contractual Obligation, Due in Fiscal Year	865,411
Contractual Obligation, Due in Second and Third Year	621,937
Contractual Obligation, Due in Fourth and Fifth Year	186,377
Contractual Obligation, Due After Fifth Year	$ 470,266

[1] (1)

[2] (2)Consists primarily of a guarantee of payments to a production service company for certain production related costs.