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Net Income Per Share (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |
Net income | $ 138,237 | $ 151,099 | $ 135,413
Less distributed and undistributed earnings allocated to participating securities | 782 | 1,759 | 1,875
Net income allocated to common shares | $ 137,455 | $ 149,340 | $ 133,538
Weighted average common shares outstanding | 38,503 | 40,186 | 41,217
Incremental shares from assumed time-vested and performance-based RSU awards and conversions of common stock options | 317 | 166 | 289
Adjusted weighted average common shares outstanding | 38,820 | 40,352 | 41,506
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect | 133 | 0 | 0

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