Restructuring - (Restructuring Charges) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Employee severance and related costs		$ 44,909	$ 76,629	$ 20,424
Consolidation of leased facilities		28,858	22,100	0
Reversal of previous charges		(2,645)	(286)	0
Restructuring Costs and Asset Impairment Charges		0	1,968	0
Restructuring Charges	[1]	$ 71,122	$ 100,411	$ 20,424

[1] Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.