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Related Party Transactions (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 08, 2016 | Apr. 01, 2016 | Mar. 31, 2016
Related Party and Similar Transactions |  |  |  |  |  |
Repurchased price |  |  |  | $ 24.95 |  | $ 21.59
Number of shares repurchased |  |  |  | $ 40,000 |  |
Percentage of difference in repurchase and closing price |  |  |  | 2.00% |  |
Closing price |  |  |  | $ 25.46 |  |
WMES | Other Revenue |  |  |  |  |  |
Related Party and Similar Transactions |  |  |  |  |  |
Asset Management Fees | $ 2,100,000 | $ 1,700,000 | $ 2,000,000 |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |
Related Party and Similar Transactions |  |  |  |  |  |
Number of shares repurchased |  |  |  |  | $ 60,000 |

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- Details
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