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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Derivative assets | $ 26,988,000 | $ 12,586,000
Derivative liabilities | 0 | 265,000
Gross unrealized gain | 42,000 |
Gross unrealized losses | 28,000 |
Unsecured Debt | Registered Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Face amount | 400,000,000.0 |
Amortization of discount | 667,000 | 722,000
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
U.S. Government securities | 148,315,000 | 0
Due in 1 year | 6,107,000 |
Due in 1 year through 5 years | 142,208,000 |
Total | 148,315,000 |
Carrying Value | Unsecured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Debt | 1,984,333,000 | 1,974,278,000
Carrying Value | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Debt | 365,519,000 | 464,311,000
Carrying Value | In-Substance Defeased Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Debt | 139,003,000 | 0
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
U.S. Government securities | 148,328,000 | 0
Due in 1 year | 6,120,000 |
Due in 1 year through 5 years | 142,208,000 |
Total | 148,328,000 |
Fair Value | Unsecured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Debt | 1,928,411,000 | 1,960,560,000
Fair Value | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Debt | 353,810,000 | 458,441,000
Fair Value | In-Substance Defeased Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Debt | 136,515,000 | 0
Non-Real Estate Investment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
U.S. Government securities | 2,713,000 | 0
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Level 1 | Non-Real Estate Investment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
U.S. Government securities | 0 | 0
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Derivative assets | 26,988,000 | 12,586,000
Derivative liabilities | 0 | 265,000
Level 2 | Non-Real Estate Investment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
U.S. Government securities | 2,713,000 | 0
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Level 3 | Non-Real Estate Investment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
U.S. Government securities | $ 0 | $ 0

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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