Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 72,277	$ 81,355
Non-mortgage loans receivable, net	54,164	59,857
Debt Securities, Available-for-sale	206,442	0
Liabilities:
Long-term debt, gross	10,829,702	11,365,633
Redeemable OP Unitholder interests, Fair Value	174,600	146,300
Commercial Mortgage Backed Securities
Assets:
Debt Securities, Held-to-maturity	439,491	1,291,694
Debt Securities, Held-to-maturity, Fair Value	425,290	1,286,322
Government-Sponsored Pooled Loan Investments
Assets:
Debt Securities, Available-for-sale	56,378	54,665
Derivative Instruments
Assets:
Debt Securities, Available-for-sale	206,442
Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, net	54,164	59,857
Non-mortgage loans receivable, fair value	54,081	58,849
Carrying Amount
Assets:
Cash and cash equivalents	72,277	81,355
Derivative Asset	6,012	7,248
Liabilities:
Long-term debt, gross	10,829,702	11,365,633
Derivative Liability	4,561	5,435
Redeemable Noncontrolling Interest, Equity, Carrying Amount	174,552	146,252
Carrying Amount \| Commercial Mortgage Backed Securities
Assets:
Debt Securities, Held-to-maturity	439,491	1,291,694
Carrying Amount \| Debt Securities
Assets:
Debt Securities, Available-for-sale	206,442	0
Carrying Amount \| Government-Sponsored Pooled Loan Investments
Assets:
Debt Securities, Available-for-sale	56,378	54,665
Carrying Amount \| Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, net	54,164	59,857
Fair Value
Assets:
Cash and Cash Equivalents, Fair Value Disclosure	72,277	81,355
Derivative Asset	6,012	7,248
Liabilities:
Long-term Debt, Fair Value	10,617,074	11,600,750
Derivative Liability	4,561	5,435
Redeemable OP Unitholder interests, Fair Value	174,552	146,252
Fair Value \| Commercial Mortgage Backed Securities
Assets:
Debt Securities, Held-to-maturity, Fair Value	425,290	1,286,322
Fair Value \| Debt Securities
Assets:
Debt Securities, Available-for-sale	206,442	0
Fair Value \| Government-Sponsored Pooled Loan Investments
Assets:
Debt Securities, Available-for-sale	56,378	54,665
Fair Value \| Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, fair value	$ 54,081	$ 58,849

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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