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Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  | $ 286,462 |  | $ 271,023
Other comprehensive income, net of tax |  | $ 1,259 | $ 600 |
Accounting Standards Update 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other comprehensive income, net of tax | $ 147 |  |  |

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