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Geographic Information (Revenues By Geographic Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues $ 947,947 $ 1,013,122 $ 1,014,287 $ 986,680 $ 922,793 $ 995,250 $ 997,827 $ 953,317 $ 3,962,036 $ 3,869,187 $ 3,733,507
United States [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 3,493,459 3,441,141 3,308,226
Canada [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 228,685 223,270 238,590
Other foreign countries [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 $ 239,892 $ 204,776 $ 186,691