Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Government-Sponsored Pooled Loan Investments
Liabilities:
Derivative instruments	$ 54,665	$ 55,049
Carrying Amount
Liabilities:
Senior notes payable and other debt, gross	11,365,633	11,190,914
Derivative instruments	5,435	2,316
Cash and cash equivalents	81,355	286,707
Secured mortgage loans and other, net	1,291,694	646,972
Redeemable OP unitholder interests	146,252
Carrying Amount \| Government-Sponsored Pooled Loan Investments
Liabilities:
Derivative instruments	54,665	55,049
Carrying Amount \| Derivative Instruments
Liabilities:
Derivative instruments	7,248	3,302
Carrying Amount \| Non-Mortgage Loan Receivable
Liabilities:
Non-mortgage loans receivable, net	59,857	52,544
Fair Value
Liabilities:
Senior notes payable and other debt, gross	11,600,750	11,369,440
Derivative instruments	5,435	2,316
Cash and cash equivalents	81,355	286,707
Secured mortgage loans and other, net	1,286,322	655,981
Fair Value \| Government-Sponsored Pooled Loan Investments
Liabilities:
Derivative instruments	54,665	55,049
Fair Value \| Derivative Instruments
Liabilities:
Derivative instruments	7,248	3,302
Fair Value \| Non-Mortgage Loan Receivable
Liabilities:
Non-mortgage loans receivable, net	58,849	53,626
General Partner
Liabilities:
Redeemable OP unitholder interests	$ 146,252	$ 177,177

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivative instrument obligations meeting the definition of a liability which the entity is a party to and other liabilities not separately disclosed by the entity as of the balance sheet date.

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