Income Taxes (Reconciliation of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amount
Federal income tax expense (benefit) at statutory tax rate	$ (56,211)	$ 33,554	$ 36,599
State income taxes, net of federal tax benefit	(21,784)	8,301	8,518
Stock based compensation	1,227	87	3,185
Impact of federal tax law changes	0	0	(14,476)
Officers' compensation	2,840	3,664	2,486
Noncontrolling interests	(3,861)	(8,872)	(9,799)
Federal R&D credits	128	(1,105)	(3,007)
Foreign tax rate differences	(1,438)	(625)	1,491
Federal claim of right credit	0	(8,191)	0
Valuation allowance	7,991	0	0
Other	(3,990)	(1,181)	(3,055)
Total expense (benefit):	$ (75,098)	$ 25,632	$ 21,942
Rate
Federal income tax expense (benefit) at statutory tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	8.10%	5.20%	4.90%
Stock based compensation	(0.50%)	0.10%	1.80%
Impact of federal tax law changes	0.00%	0.00%	(8.30%)
Officers' compensation	(1.10%)	2.30%	1.40%
Noncontrolling interests	1.40%	(5.60%)	(5.60%)
Federal R&D credits	0.00%	(0.70%)	(1.70%)
Foreign tax rate differences	0.50%	(0.40%)	0.90%
Federal claim of right credit	0	(0.051)	0
Valuation allowance	(3.00%)	0.00%	0.00%
Other	1.70%	(0.80%)	(1.80%)
Income tax expense (benefit)	28.10%	16.00%	12.60%