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Operating Leases (Rent Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense $ 152,786 $ 144,139 $ 139,025
Leased Facilities and Equipment [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense 110,123 105,961 103,294
Leased Vehicles [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense $ 42,663 $ 38,178 $ 35,731