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Subsequent Events (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 23, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Apr. 30, 2018 | Dec. 31, 2017 | Apr. 17, 2018
Subsequent Event [Line Items] |  |  |  |  |  |
Stock repurchase authorized amount |  |  | $ 200,000,000.0 |  |  |
Shares repurchased during period |  |  | $ 31,961,000 |  |  |
Number of shares repurchased during period (in shares) |  |  | 1,304,194 |  | 0 |
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Shares repurchased during period |  | $ 21,800,000 |  | $ 53,800,000 |  |
Number of shares repurchased during period (in shares) |  | 936,541 |  | 2,240,735 |  |
Subsequent Event | Fund II |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Capital distribution | $ 15,000,000 |  |  |  |  |
Subsequent Event | Fund II | Partnership Interest |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Capital distribution | $ 4,300,000 |  |  |  |  |
Subsequent Event | Disposed of by sale | Sherman Avenue [Member] | Fund II |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Consideration received |  |  |  |  |  | $ 26,000,000

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