Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal									$ 73,119	$ 72,712	$ 80,690
Foreign									20,360	6,134	7,360
State and Local									20,848	26,703	24,451
Total Current									114,327	105,549	112,501
Deferred:
Federal									9,640	(2,169)	(4,771)
Foreign									3,290	(5,022)	(61)
State and Local									894	(3,312)	851
Total Deferred									13,824	(10,503)	(3,981)
Total	$ 77,109	$ 15,677	$ 21,814	$ 13,551	$ 34,793	$ 20,402	$ 32,030	$ 7,821	$ 128,151	$ 95,046	$ 108,520