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Anti-dilutive Shares (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restricted stock awards with performance only targets not yet achieved |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Antidilutive (shares) | 846,715 | 1,507,366 | 864,946 | 1,511,868
Stock options with performance only targets not yet achieved |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Antidilutive (shares) | 376,812 | 509,888 | 376,812 | 516,110
Anti-dilutive restricted stock awards, restricted stock units and performance stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Antidilutive (shares) | 0 | 2,262,974 | 0 | 1,421,401
Anti-dilutive stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Antidilutive (shares) | 0 | 844,475 | 0 | 847,641
Anti-dilutive stock options | $16.97 (usd per share) |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Antidilutive (shares) |  | 603,159 |  | 606,325
Exercise price (usd per share) |  | $ 16.97 |  | $ 16.97
Anti-dilutive stock options | $17.50 (usd per share) |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Antidilutive (shares) |  | 241,316 |  | 241,316
Exercise price (usd per share) |  | $ 17.50 |  | $ 17.50

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