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Operating Leases (Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 132,390 | $ 125,579 | $ 119,674
Leased Facilities [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | 99,483 | 96,540 | 95,808
Leased Vehicles [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 32,907 | $ 29,039 | $ 23,866

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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