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Employee Benefits and Share-Based Compensation - Stock Repurchase Program (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Aug. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares acquired (in shares) | 0 | 0 | 0 | 0 |
The 2016 Repurchase Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock repurchase, authorized amount |  |  |  |  | $ 50,000,000.0
2016 and 2014 Share Repurchase Programs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock repurchase, remaining authorized repurchase amount | $ 54,900,000 |  | $ 54,900,000 |  |

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