Fair Value Disclosures (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, after Allowance for Credit Loss, Current	$ 357,668	$ 357,391
Debt	3,854,088	3,102,830
Fixed Rate Mortgage Notes Receivable [Member]
Financing Receivable, after Allowance for Credit Loss, Current	$ 357,700
Mortgage notes and related accrued interest receivable		$ 357,400
Weighted average interest rate of mortgage notes receivable	9.03%	8.98%
Receivable interest rate minimum	6.99%	6.99%
Receivable interest rate maximum	11.78%	11.61%
Weighted market rate used for determining future cash flow for notes receivable	8.00%	7.76%
Fair value of notes receivable	$ 390,000	$ 395,600
Variable Rate Debt [Member]
Debt	$ 1,200,000	$ 425,000
Long-term debt, weighted average interest rate	2.21%	2.75%
Variable Rate Converted to Fixed Rate [Member]
Debt	$ 425,000
Fixed Rate Debt [Member]
Debt	$ 2,720,000	$ 2,720,000
Long-term debt, weighted average interest rate	4.62%	4.54%
Weighted market rate for determining fair value of debt	5.71%	3.51%
Long-term Debt, Fair Value	$ 2,540,000	$ 2,870,000
Minimum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes	7.99%	6.99%
Minimum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt	5.00%	2.87%
Maximum [Member] \| Fixed Rate Mortgage Notes Receivable [Member]
market rate used as discount factor to determine fair value of notes	9.25%	9.25%
Maximum [Member] \| Fixed Rate Debt [Member]
market rate used as discount factor to determine fair value of debt	6.06%	4.56%

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- Definition

market rate used as discount factor to determine fair value of notes

+ References

No definition available.

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- Definition

The balance represents the amount of loans, including accrued interest receivable, that are secured by real estate mortgages, offset by the allowance for loan losses.

+ References

No definition available.

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- Definition

Mortgage receivable weighted average interest rate

+ References

No definition available.

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- Definition

Receivable interest rate stated percentage rate range maximum

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No definition available.

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Receivable interest rate stated percentage rate range minimum.

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Weighted Average Market Rate Used As Discount Factor To Determine Fair Value Of Debt

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No definition available.

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Weighted Average Market Rate Used As Discount Factor To Determine Fair Value Of Notes

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No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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- Definition

Amount, after allowance for credit loss, of financing receivable, classified as current. Includes, but is not limited to, notes and loan receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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