Income Taxes (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 209,961	$ 181,043	$ 125,015
Federal income tax expense at statutory rate	44,092	38,018	26,253
Increases (decreases) resulting from:
State income taxes, net of federal income tax benefits	13,946	12,974	6,047
Non-deductible expenses	6,205	2,859	2,048
Excess tax benefits on stock-based compensation	(561)	(206)	(1,488)
Changes in valuation allowance, net of equity and tax audit adjustments	(504)	(440)	(2,525)
Other	(371)	916	750
Income tax expense	$ 62,807	$ 54,121	$ 31,085