Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Segments and Related Information [Line Items]
Revenue			$ 1,158,184	$ 974,225
Property and equipment, net	$ 570,479	$ 549,084	570,479
Intangible assets and goodwill, net	1,172,400	1,175,600	1,172,400
United States [Member]
Segments and Related Information [Line Items]
Revenue			1,100,000	900,000
Property and equipment, net	502,200	475,300	502,200
Intangible assets and goodwill, net	1,100,000	1,100,000	1,100,000
Foreign Operations [Member]
Segments and Related Information [Line Items]
Revenue			59,200	$ 83,500
Property and equipment, net	68,300	73,800	68,300
Intangible assets and goodwill, net	$ 108,200	$ 107,800	$ 108,200
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	10.00%	8.00%