Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segments and Related Information [Line Items]
Revenue			$ 1,890,180	$ 1,232,404	$ 3,048,364	$ 2,206,630
Property and equipment, net	$ 648,456	$ 549,084	648,456		648,456
Intangible assets and goodwill, net	1,226,200	1,175,600	1,226,200		1,226,200
United States [Member]
Segments and Related Information [Line Items]
Revenue			1,800,000	1,200,000	2,900,000	2,100,000
Property and equipment, net	583,800	475,300	583,800		583,800
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			40,500	$ 65,500	99,700	$ 149,000
Property and equipment, net	64,700	73,800	64,700		64,700
Intangible assets and goodwill, net	$ 110,600	$ 107,800	$ 110,600		$ 110,600
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	5.00%	8.00%