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Operating Leases Operating Leases (Tables) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Next Twelve Months $ 44,629
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years 40,510
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years 38,005
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Four Years 32,440
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years 26,720
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Thereafter 66,972
Future Minimum Sublease Rentals, Sale Leaseback Transactions $ 249,276