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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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