Fair Value (Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets:
Cash and Restricted cash	$ 922,624	$ 1,216,637	$ 1,282,744	$ 1,242,997
Liabilities:
Variable-rate debt	1,251,473	1,238,857
Allowance for accounts receivable	10,900	16,500
Notes receivable
Liabilities:
Allowance for notes receivable	100	200
Level 1 | Carrying Amount
Assets:
Cash and Restricted cash	922,624	1,216,637
Level 1 | Estimated Fair Value
Assets:
Cash and Restricted cash	922,624	1,216,637
Level 3 | Carrying Amount
Assets:
Accounts receivable, net	96,219	86,388
Notes receivable, net	5,729	7,561
Level 3 | Estimated Fair Value
Assets:
Accounts receivable, net	96,219	86,388
Notes receivable, net	5,729	7,561
Level 2 | Carrying Amount
Liabilities:
Fixed-rate debt	3,320,845	3,125,559
Variable-rate debt	1,526,473	1,513,857
Level 2 | Estimated Fair Value
Liabilities:
Fixed-rate debt	2,874,854	3,186,139
Variable-rate debt	$ 1,526,473	$ 1,513,857