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v3.19.1

Combined Guarantor Subsidiaries - Mortgage Notes Payable, Net - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Principal maturities for remainder of fiscal year | $ 217,655 |  |
Weighted-average maturity period | 4 years 5 months | 3 years 8 months |
Guarantor Subsidiaries |  |  |
Debt Instrument [Line Items] |  |  |
Principal maturities for remainder of fiscal year | $ 71,187 |  |
Weighted-average maturity period | 2 years 1 month 10 days | 1 year 29 days |
Guarantor Subsidiaries | Greenbrier Mall |  |  |
Debt Instrument [Line Items] |  |  |
Principal maturities for remainder of fiscal year | $ 67,201 |  |
Guarantor Subsidiaries | Principal Amortization |  |  |
Debt Instrument [Line Items] |  |  |
Principal maturities for remainder of fiscal year | $ 3,986 |  |
Guarantor Subsidiaries | Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Total Outstanding |  |  | $ 37,295
Interest rate (as a percent) |  |  | 5.75%

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