Fair Value Disclosures (Assets and Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2020	Dec. 31, 2019
Long-term Debt		$ 3,854,855	$ 3,102,830
Derivative Asset, Fair Value, Gross Asset		4,000	1,100
Derivative Liability, Fair Value, Gross Liability		(11,700)	(4,500)
Financing Receivable, after Allowance for Credit Loss, Current		362,011	357,391
Fair Value, Recurring [Member] | Cross Currency Swaps [Member]
Derivative Asset, Fair Value, Gross Asset	[1]	3,958	828
Fair Value, Recurring [Member] | Cross Currency Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset, Fair Value, Gross Asset	[1]	3,958	828
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Derivative Asset, Fair Value, Gross Asset	[1]		(225)
Derivative Liability, Fair Value, Gross Liability	[2]	(11,717)	(4,495)
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset, Fair Value, Gross Asset	[1]		(225)
Derivative Liability, Fair Value, Gross Liability	[2]	(11,717)	(4,495)
Variable Rate Converted to Fixed Rate [Member]
Long-term Debt		425,000	$ 425,000
Fixed Rate Mortgage Notes Receivable Member
Financing Receivable, after Allowance for Credit Loss, Current		$ 362,000
Mortgage Receivable Weighted Average Interest Rate		9.02%	8.98%
Receivable Interest Rate Stated Percentage Rate Range Minimum		7.01%	6.99%
Receivable Interest Rate Stated Percentage Rate Range Maximum		11.78%	11.61%
Notes Receivable, Fair Value Disclosure		$ 393,200	$ 395,600
Weighted Average Market Rate Used As Discount Factor To Determine Fair Value Of Notes		8.03%	7.76%
Mortgage Notes and Related Accrued Interest Receivable, Net			$ 357,400
Fixed Rate Mortgage Notes Receivable Member | Minimum [Member]
market rate used as discount factor to determine fair value of notes		7.50%	6.99%
Fixed Rate Mortgage Notes Receivable Member | Maximum [Member]
market rate used as discount factor to determine fair value of notes		9.25%	9.25%
Variable Rate Debt Member
Long-term Debt		$ 1,200,000	$ 425,000
Long-term Debt, Weighted Average Interest Rate, at Point in Time		2.22%	2.75%
Fixed Rate Debt Member
Long-term Debt		$ 2,720,000	$ 2,720,000
Long-term Debt, Weighted Average Interest Rate, at Point in Time		4.62%	4.54%
Long-term Debt, Fair Value		$ 2,580,000	$ 2,870,000
Weighted Average Market Rate Used As Discount Factor To Determine Fair Value Of Debt		5.44%	3.51%
Fixed Rate Debt Member | Minimum [Member]
market rate used as discount factor to determine fair value of debt		5.00%	2.87%
Fixed Rate Debt Member | Maximum [Member]
market rate used as discount factor to determine fair value of debt		5.68%	4.56%

[1] Included in "Other assets" in the accompanying consolidated balance sheets.

[2] Included in "Accounts payable and accrued liabilities" in the accompanying consolidated balance sheets.