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Operating Leases Operating Leases (Tables) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Next Twelve Months	$ 27,423
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Two Years	26,760
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years	25,424
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Four Years	24,172
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years	21,435
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Thereafter	63,561
Future Minimum Sublease Rentals, Sale Leaseback Transactions	$ 188,775

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