Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segments and Related Information [Line Items]
Revenue			$ 1,111,010	$ 1,315,488	$ 3,180,906	$ 3,380,538
Property and equipment, net	$ 586,993	$ 623,118	586,993		586,993
Intangible assets and goodwill, net	$ 1,283,600	$ 1,332,800	1,283,600		1,283,600
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Foreign Customers [Member]
Segments and Related Information [Line Items]
Concentration risk, percentage of total	16.00%	20.00%
United States [Member]
Segments and Related Information [Line Items]
Revenue			1,000,000	1,100,000	2,700,000	2,900,000
Property and equipment, net	$ 482,400	$ 494,100	482,400		482,400
Intangible assets and goodwill, net	1,100,000	1,100,000	1,100,000		1,100,000
Foreign Operations [Member]
Segments and Related Information [Line Items]
Revenue			115,200	$ 219,700	451,200	$ 460,300
Property and equipment, net	104,600	129,000	104,600		104,600
Intangible assets and goodwill, net	$ 193,900	$ 227,700	$ 193,900		$ 193,900