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Fair Value of Assets and Liabilities - Liabilities (Details) $ in Thousands	Jun. 30, 2018 USD ($) debt_security	Dec. 31, 2017 USD ($)
Liabilities:
Senior unsecured notes	$ 2,214,856	$ 1,725,662
Carrying Amount
Liabilities:
Senior unsecured notes	2,214,856	1,725,662
Secured debt	833,353	794,710
Debt instrument	3,048,209	2,520,372
Estimated Fair Value
Liabilities:
Senior unsecured notes	2,268,429	1,810,882
Secured debt	798,986	783,353
Debt instrument	$ 3,067,415	$ 2,594,235
Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Fair value measurement, number of debt securities | debt_security	2
Significant Other Observable Inputs (Level 2)
Liabilities:
Fair value measurement, number of debt securities | debt_security	5

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Fair Value Measurement, Number of Debt Securities

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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)
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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.

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-Topic 944
-SubTopic 210
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