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Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 13, 2017 | Aug. 18, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |
Treasury stock acquired, shares |  |  | 1,101,969 | 574,054
Average cost per share (in usd per share) |  |  | $ 16.03 | $ 24.35
Payments for repurchase of equity |  |  | $ 17.7 | $ 14.0
Board of Directors Chairman [Member] | Share Repurchase [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Treasury stock acquired, shares |  | 100,000 |  |
Average cost per share (in usd per share) |  | $ 23.85 |  |
Payments for repurchase of equity |  | $ 2.4 |  |
Purchases from related party | $ 0.3 |  |  |

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