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Income Taxes - Adoption of ASU 2016-09 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Adoption of new accounting pronouncements |  |  |
Tax benefits related to certain restricted stock and stock options |  |  | $ 318
ASU 2016-09 |  |  |
Adoption of new accounting pronouncements |  |  |
Increase in provision for income taxes | $ 46 | $ 169 |

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