Discontinued Operations - Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	$ 2,608,727
Cumulative-effect adjustment from adoption of accounting standard on stock-based compensation	386
Distribution of the net assets of the GoTo Business	(465,974)
Shares issued under stock-based compensation plans	902
Stock-based compensation expense	36,012
Temporary equity reclassification	79,495
Stock repurchases, net	(500,000)	$ (28,700)
Restricted shares turned in for tax withholding	(56,950)
Other comprehensive gain, net of tax	4,370	7,464
Net income	27,621	$ 83,463
Other	(847)
Balance, ending	$ 1,733,742