Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal current	$ 53,297	$ 29,102	$ 7,428
State current	12,106	9,547	9,841
Foreign current	446	(88)	770
Current income tax expense (benefit), total	65,849	38,561	18,039
Federal deferred	(8,988)	15,094	37,284
State deferred	(1,245)	1,307	410
Deferred income tax expense (benefit), total	(10,233)	16,401	37,694
Total income tax expense (benefit)	$ 55,616	$ 54,962	$ 55,733