Commitments and Contingencies (Future Minimum Payments Under Lease Financing Obligations and Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 101,987
2019	97,560
2020	96,255
2021	85,188
2022	77,418
Thereafter	278,970
Total minimum payments	$ 737,378

Capital and Operating Leases, Future Minimum Payments Due

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Capital and Operating Leases, Future Minimum Payments, Due Thereafter

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Capital and Operating Leases, Future Minimum Payments, Due in Five Years

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Capital and Operating Leases, Future Minimum Payments, Due in Four Years

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Capital and Operating Leases, Future Minimum Payments, Due in Three Years

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Capital and Operating Leases, Future Minimum Payments, Due in Two Years

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Capital and Operating Leases, Future Minimum Payments, Next Twelve Months

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