Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 79,926	$ 107,699	$ 99,830
State	27,401	39,028	38,356
Foreign	20,018	33,227	35,007
Deferred:
Federal and state	(9,089)	(9,959)	(15,849)
Foreign	(2,650)	1,087	(30)
Provision (benefit) for income taxes	$ 115,606	$ 171,082	$ 157,314