Income Taxes - Provision for Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of provision for income taxes
Current income tax expense	$ 80,373	$ 76,535	$ 84,454
Deferred income tax (benefit) expense	(5,162)	3,349	(1,358)
Income tax expense	$ 75,211	$ 79,884	$ 83,096