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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	$ 21,922,000	$ 12,586,000
Derivative liabilities	0	265,000
Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes payable	1,856,896,000	1,960,560,000
Unsecured Debt | Registered Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Face amount	400,000,000.0
Amortization of discount	704,000	722,000
Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes payable	356,935,000	458,441,000
Carrying Value | Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes payable	1,894,296,000	1,974,278,000
Carrying Value | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes payable	365,782,000	464,311,000
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	0	0
Derivative liabilities	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Investment in shares			$ 1,800,000
Derivative assets	21,922,000	12,586,000
Derivative liabilities	0	265,000
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	0	0
Derivative liabilities	$ 0	$ 0

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- Definition

Fair value portion of investments accounted under the cost method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
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Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt discount.

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