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Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenues from External Customers [Line Items]        
Revenues $ 629,401 $ 572,123 $ 1,819,529 $ 1,487,491
Revenue as Percentage of Consolidated Revenue 100.00% 100.00% 100.00% 100.00%
Domestic [Member]        
Revenues from External Customers [Line Items]        
Revenues $ 599,991 $ 546,747 $ 1,732,594 $ 1,420,492
Revenue as Percentage of Consolidated Revenue 95.30% 95.60% 95.20% 95.50%
Foreign [Member]        
Revenues from External Customers [Line Items]        
Revenues $ 29,410 $ 25,376 $ 86,935 $ 66,999
Revenue as Percentage of Consolidated Revenue 4.70% 4.40% 4.80% 4.50%