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Subsequent Events (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2016 USD ($) loan | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |
Expected gain on sale of real estate |  |  | $ 0 | $ 757 |  |  |
Proceeds from sales of real estate assets |  |  | 33,425 | $ 11,261 |  |  |
Mortgages |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt retired |  |  | $ 100,009 |  |  |  |
Mortgages | Minimum |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  | 4.54% |  |  |  |
Mortgages | Maximum |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  | 4.59% |  |  |  |
Mortgages | Renaissance Center - Phase I |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt retired |  |  | $ 31,484 |  |  |  |
Subsequent Event | Mortgages |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of loans retired | loan | 4 |  |  |  |  |  |
Subsequent Event | Mortgages | Hickory Point Mall |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 5.85% |  |  |  |  |  |
Debt instrument, option extension term (in years) | 1 year |  |  |  |  |  |
Renaissance Center | Parent Company | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Company's Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
Renaissance Center | Corporate Joint Venture | Scenario, Forecast |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Expected gain on sale of real estate |  | $ 56,986 |  |  |  |  |
Renaissance Center | Corporate Joint Venture | Other Ownership Interest | Scenario, Forecast |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Expected gain on sale of real estate |  | 29,993 |  |  |  |  |
Renaissance Center | Corporate Joint Venture | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Company's Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
Sales price | $ 129,200 |  |  |  |  |  |
Renaissance Center | Corporate Joint Venture | Subsequent Event | Mortgages |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Mortgage note payables assumed | 16,000 |  |  |  |  |  |
Renaissance Center | Corporate Joint Venture | Subsequent Event | Other Ownership Interest |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Mortgage note payables assumed | 64,600 |  |  |  |  |  |
The Crossings at Marshalls Creek | Scenario, Forecast |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Expected gain on sale of real estate |  | $ 3,259 |  |  |  |  |
The Crossings at Marshalls Creek | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Sales price | 23,650 |  |  |  |  |  |
Proceeds from sales of real estate assets | $ 21,854 |  |  |  |  |  |
Mortgages | Village Square |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Interest Rate |  |  | 3.50% |  |  |  | 3.50%
Mortgages | Village Square | Scenario, Forecast |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Interest Rate |  |  |  |  | 4.00% | 3.75% |

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