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Share-Based Payments - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 16, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense | $ 4,294 |  | $ 4,014 |  | $ 8,195 | $ 7,356 |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | 500 |  |  |  | 500 |  |  |
RSU |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | $ 23,300 |  |  |  | $ 23,300 |  |  |
LTIP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  | 7,000,000 |
Common stock, shares delivered |  |  |  |  | 433,426 | 345,996 |  |
LTIP | RSU |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock units vested |  |  |  |  | 730,717 | 603,677 |  |
Adjustments to additional paid in capital, income tax deficiency from share-based compensation |  |  |  |  | $ 5,000 | $ 4,700 |  |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  | $ 16.66
Common stock, shares delivered | 27,245 | 433,426 | 28,070 | 345,996 |  |  |  |

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