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Operating Leases (Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 125,579 | $ 119,674 | $ 114,394
Leased Facilities [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | 96,540 | 95,808 | 92,854
Leased Vehicles [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 29,039 | $ 23,866 | $ 21,540

X
- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration