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Stock-Based Compensation - Vesting and Deferred Compensation Plan (Details) - shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Restricted stock awards |  |  |
Stock-based compensation |  |  |
Vesting period of shares awarded under the Program | 3 years |  |
Performance share awards |  |  |
Stock-based compensation |  |  |
Vesting period of shares awarded under the Program |  | 3 years |
Deferred Compensation Equity |  |  |
Performance share awards |  |  |
Number of common stock deferred (in shares) |  | 275,446 | 253,520

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