Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segments and Related Information [Line Items]
Revenue			$ 1,066,629	$ 1,107,232	$ 2,069,896	$ 2,065,050
Property and equipment, net	$ 614,826	$ 623,118	614,826		614,826
Intangible assets and goodwill, net	$ 1,303,200	$ 1,332,800	1,303,200		1,303,200
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	22.00%	20.00%
United States [Member]
Segments and Related Information [Line Items]
Revenue			913,700	992,600	1,700,000	1,800,000
Property and equipment, net	$ 498,100	$ 494,100	498,100		498,100
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			152,900	$ 114,600	336,000	$ 240,600
Property and equipment, net	116,700	129,000	116,700		116,700
Intangible assets and goodwill, net	$ 207,700	$ 227,700	$ 207,700		$ 207,700