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Stock-based Compensation (Details) - Equity Incentive Plan - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock-based Compensation |  |  |  |
Recorded compensation costs for the RSAs and RSUs | $ 1.2 | $ 0.8 | $ 3.9 | $ 1.5
Restricted Stock Awards (RSAs) |  |  |  |
Stock-based Compensation |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  | $ 52.83 | $ 35.40
Restricted Stock Awards (RSAs) | Officers and Directors |  |  |  |
Stock-based Compensation |  |  |  |
Awards granted (in shares) | 0 | 0 | 36,183 | 46,135
Awards canceled (in shares) | 2,544 | 3,842 | 10,878 | 13,306
Restricted Stock Awards (RSAs) | Director |  |  |  |
Stock-based Compensation |  |  |  |
Vesting period |  |  | 12 months |
Restricted Stock Awards (RSAs) | Officer |  |  |  |
Stock-based Compensation |  |  |  |
Vesting period |  |  | 36 months |
Restricted Stock Unit Award (RSUs) | Officer |  |  |  |
Stock-based Compensation |  |  |  |
Awards granted (in shares) | 0 | 0 | 26,473 | 28,594
Awards canceled (in shares) | 0 | 0 | 31,177 | 24,009
Weighted average grant date fair value (in dollars per share) |  |  | $ 52.83 | $ 35.40
Awards issued (in shares) | 0 | 0 | 62,726 | 48,753
Expiration period of award |  |  | 3 years |

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