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Operating Leases (Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 139,025 us-gaap_LeaseAndRentalExpense | $ 132,390 us-gaap_LeaseAndRentalExpense | $ 125,579 us-gaap_LeaseAndRentalExpense
Leased Facilities and Equipment [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | 103,294 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember | 99,483 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember | 96,540 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember
Leased Vehicles [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 35,731 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_VehiclesMember | $ 32,907 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_VehiclesMember | $ 29,039 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_VehiclesMember

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- 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

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

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_PropertySubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |