Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2018	Oct. 29, 2020	Jan. 21, 2015
Class of stock
Accelerated share repurchase program, upfront payment	$ 50,000
Repurchase and retirement of common stock under repurchase plan, shares	(2,600,000)
Repurchase and retirement of common stock under repurchase plan, value	$ (40,000)	$ (50,069)	$ (50,033)
Remaining initial payment, unsettled forward contract indexed to Company's stock	$ 10,000
Remaining shares authorized to be repurchased	17,400,000	17,400,000
2015 Share repurchase program
Class of stock
Number of shares authorized to be repurchased under the plan					20,000,000.0
2020 Share repurchase program
Class of stock
Number of shares authorized to be repurchased under the plan				20,000,000.0