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Fair Value of Assets and Liabilities - Schedule of Carrying Values and Estimated Fair Value of Debt Instruments (Details) $ in Thousands	Dec. 31, 2017 USD ($) debt_security	Dec. 31, 2016 USD ($)
Assets and liabilities measured at fair value
Senior unsecured notes	$ 1,725,662	$ 1,722,758
Carrying Amount
Assets and liabilities measured at fair value
Senior unsecured notes	1,725,662	1,722,758
Secured debt	794,710	1,106,183
Secured and secured debt	2,520,372	2,828,941
Estimated Fair Value
Assets and liabilities measured at fair value
Senior unsecured notes	1,810,882	1,755,715
Secured debt	783,353	1,090,515
Secured and secured debt	$ 2,594,235	$ 2,846,230
Level 1
Assets and liabilities measured at fair value
Fair Value Measurement, Number of Debt Securities | debt_security	2
Level 2
Assets and liabilities measured at fair value
Fair Value Measurement, Number of Debt Securities | debt_security	4

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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