Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Foreign currency translation adjustments, net of tax(1)	$ (280,426)	$ (284,767)
Net unrealized gain (loss) on available for sale securities, net of tax	27	(127)
Accumulated other comprehensive loss	(280,399)	(284,894)
2.5% Senior Notes Due 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation gains (losses), net of tax	16,000	(1,000)
Foreign currency translation gains (losses), before tax	$ 25,000	$ (2,000)
Senior notes, interest rate	2.50%	2.50%	2.50%	2.50%