Fair Value Disclosures (Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Estimated fair value of the Company's debt obligations compared to their carrying amounts
Secured loans, Carrying Amounts	$ 5,713,688	$ 5,838,889
Total debt obligations, net	5,713,688	5,838,889
Carrying Amounts
Estimated fair value of the Company's debt obligations compared to their carrying amounts
Secured loans, Carrying Amounts	932,589	1,337,094
Notes payable, Carrying Amounts	3,181,182	2,291,954
Unsecured Credit Facility and Term Loan, Carrying Amounts	1,599,917	2,209,841
Total debt obligations, net	5,713,688	5,838,889
Fair Value
Estimated fair value of the Company's debt obligations compared to their carrying amounts
Secured loans, Fair Value	989,296	1,410,698
Notes payable, Fair Value	3,231,275	2,302,048
Unsecured Credit Facility and Term Loan, Fair Value	1,611,802	2,223,807
Total debt obligations, net, Fair Value	$ 5,832,373	$ 5,936,553

Debt and Capital Lease Obligations, Fair Value Disclosure

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Line of Credit Facility, Amount Outstanding, Fair Value Disclosure

+ References

No definition available.

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- Definition

Mortgages and secured loans payable fair value disclosure.

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No definition available.

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Mortgages payable including unamortized premium.

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Fair value portion of notes payable.

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