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Net Income Per Share (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 20,395 | $ 25,859 | $ 28,556 | $ 76,289 | $ 24,655 | $ 36,207 | $ 24,560 | $ 49,991 | $ 151,099 | $ 135,413 | $ 84,402
Less distributed and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | 1,759 | 1,875 | 1,517
Net income allocated to common shares |  |  |  |  |  |  |  |  | $ 149,340 | $ 133,538 | $ 82,885
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 40,186 | 41,217 | 41,067
Incremental shares from assumed LTIP awards and conversions of common stock options |  |  |  |  |  |  |  |  | 166 | 289 | 204
Adjusted weighted average common shares outstanding |  |  |  |  |  |  |  |  | 40,352 | 41,506 | 41,271
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect |  |  |  |  |  |  |  |  | 0 | 0 | 0

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