Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Current assets	$ 542,484	$ 580,169
Fixed assets, net	3,912,185	3,851,334
TOTAL ASSETS	5,905,801	5,933,619	$ 6,597,641
LIABILITIES AND PARTNERS’ CAPITAL
Current liabilities	496,939	383,411
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	5,905,801	5,933,619
Equity Method Investment, Nonconsolidated Investee or Group of Investees
ASSETS
Current assets	33,994	42,565
Fixed assets, net	284,265	299,315
Other assets	21,327	25,654
TOTAL ASSETS	339,586	367,534
LIABILITIES AND PARTNERS’ CAPITAL
Current liabilities	15,457	13,411
Other liabilities	237,948	248,857
Equity	86,181	105,266
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 339,586	$ 367,534