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Stock Repurchase Program (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 13, 2019 | Mar. 31, 2018 | Feb. 28, 2017 | Feb. 29, 2016 | Dec. 31, 2015
2012 And 2014 Plan |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  | 56,000
February 2016 Plan |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  |  |  |  | 1,000,000 |
February 2016 Plan | Treasury Stock |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 1,056,000 |  |  |  |  |
Aggregate purchase price of shares repurchased |  |  |  | $ 9.5 |  |  |  |  |
February 2017 Plan |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  |  |  | 1,000,000 |  |
February 2017 Plan | Treasury Stock |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 1,000,000 |  |  |  |  |  |
Aggregate purchase price of shares repurchased |  |  | $ 9.7 |  |  |  |  |  |
March 2018 Plan |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  |  | 500,000 |  |  |
Stock repurchased during period (in shares) |  | 500,000 |  |  |  |  |  |  |
Aggregate purchase price of shares repurchased |  | $ 5.3 |  |  |  |  |  |  |
Subsequent Event | February 2019 Plan |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  | 100,000 |  |  |  |
Stock repurchased during period (in shares) | 100,000 |  |  |  |  |  |  |  |
Aggregate purchase price of shares repurchased | $ 1.5 |  |  |  |  |  |  |  |

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