Income Taxes (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 133,828	$ 79,559	$ 89,168
Federal income tax expense at statutory rate	28,104	16,707	31,209
Increases (decreases) resulting from:
State income taxes, net of federal income tax benefits	6,430	6,060	3,833
Impact of non-controlling interest	(9)	21	(2,162)
Non-deductible expenses	1,385	1,993	2,146
Impact of domestic production deduction	0	359	(2,960)
Impact of Tax Cuts and Jobs Act of 2017	0	(2,691)	(28,845)
Excess tax benefits on stock-based compensation	(1,488)	(778)	(1,143)
Tax credits	(166)	(127)	(2,683)
Other	791	(545)	(155)
Inclusion of tax liabilities from unincorporated entities	291	400	(47)
Changes in valuation allowance, net of equity and tax audit adjustments	(2,525)	153	(775)
Income tax expense (benefit)	$ 32,813	$ 21,552	$ (1,582)