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Commitments and Contingencies (Schedule of Future Operating Lease Payments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 31,140us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 31,407us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 31,808us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 32,338us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 33,300us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 432,138us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total committed under long term operating leases $ 592,131us-gaap_OperatingLeasesFutureMinimumPaymentsDue