Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segments and Related Information [Line Items]
Revenue			$ 1,232,404	$ 1,066,629	$ 2,206,630	$ 2,069,896
Property and equipment, net	$ 559,057	$ 558,667	559,057		559,057
Intangible assets and goodwill, net	1,190,600	1,187,900	1,190,600		1,190,600
United States [Member]
Segments and Related Information [Line Items]
Revenue			1,200,000	900,000	2,100,000	1,700,000
Property and equipment, net	469,900	464,600	469,900		469,900
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			65,500	$ 152,900	149,000	$ 336,000
Property and equipment, net	89,200	94,100	89,200		89,200
Intangible assets and goodwill, net	$ 113,600	$ 107,300	$ 113,600		$ 113,600
Foreign Operations [Member] | Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Geographic Concentration Risk [Member] | Foreign Customers [Member]
Segments and Related Information [Line Items]
Concentration risk, percentage of total	7.00%	17.00%