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Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenues from External Customers [Line Items]    
Revenues $ 582,040 $ 430,045
Revenue as Percentage of Consolidated Revenue 100.00% 100.00%
Domestic [Member]    
Revenues from External Customers [Line Items]    
Revenues $ 554,438 $ 410,756
Revenue as Percentage of Consolidated Revenue 95.30% 95.50%
Foreign [Member]    
Revenues from External Customers [Line Items]    
Revenues $ 27,602 $ 19,289
Revenue as Percentage of Consolidated Revenue 4.70% 4.50%