Fair Value (Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets:
Cash and Restricted cash	$ 1,053,520	$ 1,216,637	$ 1,174,328	$ 1,242,997
Liabilities:
Variable-rate debt	1,249,830	1,238,857
Allowance for accounts receivable	15,900	16,500
Notes receivable
Liabilities:
Allowance for notes receivable	100	200
Level 1 | Carrying Amount
Assets:
Cash and Restricted cash	1,053,520	1,216,637
Level 1 | Estimated Fair Value
Assets:
Cash and Restricted cash	1,053,520	1,216,637
Level 3 | Carrying Amount
Assets:
Accounts receivable, net	86,810	86,388
Notes receivable, net	7,192	7,561
Level 3 | Estimated Fair Value
Assets:
Accounts receivable, net	86,810	86,388
Notes receivable, net	7,192	7,561
Level 2 | Carrying Amount
Liabilities:
Fixed-rate debt	3,197,722	3,125,559
Variable-rate debt	1,524,830	1,513,857
Level 2 | Estimated Fair Value
Liabilities:
Fixed-rate debt	3,110,018	3,186,139
Variable-rate debt	$ 1,524,830	$ 1,513,857