Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future Minimum Payments Due, Remainder of 2013	$ 98,033
Future Minimum Payments Due, 2014	188,853
Future Minimum Payments Due, 2015	183,716
Future Minimum Payments Due, 2016	173,323
Future Minimum Payments Due, 2017	149,688
Future Minimum Payments Due, 2018 and thereafter	529,144
Total minimum lease payments	$ 1,322,757