| Commitments and Contingencies (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | 
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| Commitments and Contingencies Disclosure [Abstract] | |
| 2015 | $ 51,765us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent | 
| 2016 | 49,851us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears | 
| 2017 | 45,748us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears | 
| 2018 | 41,181us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears | 
| 2019 | 32,629us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears | 
| Thereafter | 114,600us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter | 
| Operating leases, future minimum payments due, total | $ 335,774us-gaap_OperatingLeasesFutureMinimumPaymentsDue | 
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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