Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Non-mortgage loans receivable, net	$ 37,926	$ 17,620
Liabilities:
Redeemable OP unitholder interests	196,529	172,016
Government-sponsored pooled loan investments
Assets:
Marketable securities	63,679	63,115
Carrying Amount
Assets:
Cash and cash equivalents	53,023	55,348
Secured loans receivable, net	793,433	739,766
Non-mortgage loans receivable, net	37,926	17,620
Liabilities:
Senior notes payable and other debt, gross	11,271,020	10,888,295
Derivative instruments and other liabilities	2,696	2,743
Redeemable OP unitholder interests	188,546	159,134
Carrying Amount \| Government-sponsored pooled loan investments
Assets:
Marketable securities	63,679	63,115
Carrying Amount \| Marketable securities
Assets:
Marketable securities	0	76,046
Fair Value
Assets:
Cash and cash equivalents	53,023	55,348
Secured loans receivable, net	816,849	748,842
Non-mortgage loans receivable, net	38,806	19,058
Liabilities:
Senior notes payable and other debt, gross	11,384,880	11,197,131
Derivative instruments and other liabilities	2,696	2,743
Redeemable OP unitholder interests	188,546	159,134
Fair Value \| Government-sponsored pooled loan investments
Assets:
Marketable securities	63,679	63,115
Fair Value \| Marketable securities
Assets:
Marketable securities	$ 0	$ 76,046

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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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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Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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No definition available.

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Fair value as of the balance sheet date of secured loans receivable, net of any write-downs taken for collection uncertainty on the part of the holder.

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No definition available.

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For an unclassified balance sheet, an unsecured amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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