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Mortgage and Other Indebtedness - Consolidated Indebtedness by Type of Debt (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Participating Mortgage Loans [Line Items] |  |
Principal | $ 1,153,302,000 | $ 1,548,770,000
Unamortized Net Premiums | 2,176,000 | 6,566,000
Unamortized Debt Issuance Costs | (8,898,000) | (12,035,000)
Long-term debt | 1,146,580,000 | 1,543,301,000
Revolving Credit Facility |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 0 | 45,600,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (2,625,000) | (3,796,000)
Long-term debt | (2,625,000) | 41,804,000
Line of credit facility, remaining borrowing capacity | $ 583,400,000 | $ 449,500,000
Basis spread on variable rate (as percent) | 1.15% | 1.15%
Interest rate, effective percentage (as percent) | 2.91% | 3.65%
Senior Unsecured Notes | Fixed Rate Debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | $ 550,000,000 | $ 550,000,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (4,231,000) | (4,864,000)
Long-term debt | $ 545,769,000 | $ 545,136,000
Senior Unsecured Notes | Fixed Rate Debt | Minimum |  |
Participating Mortgage Loans [Line Items] |  |
Interest rate during period (as percent) | 4.00% | 4.00%
Senior Unsecured Notes | Fixed Rate Debt | Maximum |  |
Participating Mortgage Loans [Line Items] |  |
Interest rate during period (as percent) | 4.57% | 4.57%
Unsecured Debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | $ 250,000,000 | $ 345,000,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (1,859,000) | (2,470,000)
Long-term debt | $ 248,141,000 | $ 342,530,000
Unsecured Debt | Unsecured Term Loans, Maturing July 2021 |  |
Participating Mortgage Loans [Line Items] |  |
Basis spread on variable rate (as percent) | 2.00% | 1.30%
Interest rate, effective percentage (as percent) | 3.76% | 3.80%
Debt instrument, face amount |  | $ 95,000,000
Unsecured Debt | Unsecured Term Loans, Maturing October 2022 |  |
Participating Mortgage Loans [Line Items] |  |
Basis spread on variable rate (as percent) |  | 2.00%
Interest rate, effective percentage (as percent) |  | 4.50%
Debt instrument, face amount |  | $ 250,000,000
Mortgages | Fixed Rate Debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | $ 297,472,000 | 534,679,000
Unamortized Net Premiums | 2,176,000 | 6,566,000
Unamortized Debt Issuance Costs | (40,000) | (584,000)
Long-term debt | $ 299,608,000 | $ 540,661,000
Mortgages | Fixed Rate Debt | Minimum |  |
Participating Mortgage Loans [Line Items] |  |
Interest rate during period (as percent) | 3.78% | 3.78%
Mortgages | Fixed Rate Debt | Maximum |  |
Participating Mortgage Loans [Line Items] |  |
Interest rate during period (as percent) | 5.73% | 6.78%
Mortgages | Variable Rate Debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | $ 55,830,000 | $ 73,491,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (143,000) | (321,000)
Long-term debt | $ 55,687,000 | $ 73,170,000
Mortgages | Variable Rate Debt | Minimum |  |
Participating Mortgage Loans [Line Items] |  |
Interest rate during period (as percent) |  | 4.00%
Basis spread on variable rate (as percent) | 1.60% | 1.50%
Mortgages | Variable Rate Debt | Maximum |  |
Participating Mortgage Loans [Line Items] |  |
Interest rate during period (as percent) |  | 4.10%
Basis spread on variable rate (as percent) | 3.36% | 1.60%

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