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Common Stock - Stock Repurchase Program (Details) - USD ($) | 3 Months Ended | 22 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Jun. 30, 2015 | Nov. 30, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, remaining amount | $ 54,900,000 |  | $ 54,900,000 |  |
Credit Facility |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share repurchase covenant | $ 4,900,000 |  |  |  |
Share Repurchase Program, November 2012 |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  |  |  | $ 25,000,000
Repurchase of common stock during period (in shares) | 0 | 0 |  |  |
Share Repurchase Program, June 2015 |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  |  | $ 50,000,000 |
Repurchase of common stock during period (in shares) |  |  | 0 |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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