Equity Investees (Schedule of Operations for Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
INCOME STATEMENT DATA:
Revenues	$ 721,725	$ 503,855	$ 1,353,672	$ 1,025,074
Operating income	96,585	25,537	148,256	53,558
Net income	35,347	(41,682)	30,097	(75,906)
Poseidon
INCOME STATEMENT DATA:
Revenues	35,380	33,757	66,569	76,170
Operating income	25,856	24,636	47,809	56,797
Net income	$ 24,441	$ 23,610	$ 45,348	$ 54,755