Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal									$ 80,690	$ 85,371	$ 79,596
Foreign									7,360	9,796	10,832
State and Local									24,451	14,955	18,832
Total Current									112,501	110,122	109,260
Deferred:
Federal									(4,771)	150,800	11,510
Foreign									(61)	(3,464)	(1,439)
State and Local									851	984	(28)
Total Deferred									(3,981)	148,320	10,043
Total	$ 60,502	$ 17,539	$ 25,541	$ 4,938	$ 188,876	$ 28,815	$ 22,459	$ 18,292	$ 108,520	$ 258,442	$ 119,303