Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended								12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment and Related Information [Line Items]
Revenue				$ 1,341,900	$ 1,586,200	$ 1,232,400	$ 974,200	$ 1,027,400	$ 1,111,000	$ 1,066,600	$ 1,003,300	$ 5,134,703	$ 4,208,330	$ 4,611,803
Property and equipment, net	$ 549,084	$ 558,667		549,084				558,667				549,084	558,667
Intangible assets and goodwill, net	$ 1,175,600	$ 1,187,900		1,175,600				1,187,900				1,175,600	1,187,900
Accounts Receivable, Net, Less BIEC [Member] | Geographic Concentration Risk [Member] | Foreign Customers [Member]
Segment and Related Information [Line Items]
Concentration risk, percentage of total	8.00%	17.00%	20.00%
United States [Member]
Segment and Related Information [Line Items]
Revenue												4,900,000	3,600,000	3,900,000
Property and equipment, net	$ 475,300	$ 464,600	$ 494,100	475,300				464,600				475,300	464,600	494,100
Intangible assets and goodwill, net	1,100,000	1,100,000	1,100,000	1,100,000				1,100,000				1,100,000	1,100,000	1,100,000
Foreign Operations [Member]
Segment and Related Information [Line Items]
Revenue												279,700	574,800	699,900
Property and equipment, net	73,800	94,100	129,000	73,800				94,100				73,800	94,100	129,000
Intangible assets and goodwill, net	$ 107,800	$ 107,300	$ 227,700	$ 107,800				$ 107,300				$ 107,800	$ 107,300	$ 227,700