Equity Investees (Schedule of Operations for Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
INCOME STATEMENT DATA:
Revenues	$ 721,248	$ 518,821	$ 2,074,920	$ 1,543,895
Operating income	75,095	34,494	223,351	88,052
Net income	3,385	(20,899)	33,482	(96,805)
Poseidon
INCOME STATEMENT DATA:
Revenues	38,322	27,262	104,891	103,432
Operating income	27,731	18,762	75,540	75,559
Net income	$ 25,502	$ 17,718	$ 70,850	$ 72,473