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Summary of Significant Accounting Policies - Calculation of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ 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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in usd) | $ 33,001 | $ 25,454 | $ 93,822 | $ 32,166 | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 184,443 | $ 18,343 | $ 169,459
Weighted average number of common shares during the period (in thousands) | 41,814,000,000 | 41,785,000,000 | 41,762,000,000 | 41,610,000,000 | 41,596,000,000 | 41,683,000,000 | 41,600,000,000 | 41,497,000,000 | 41,419,000,000 | 41,433,000,000 | 41,368,000,000 | 41,135,000,000 | 41,737,876 | 41,570,492 | 41,364,546
Net income per share - basic (in usd per share) | $ 0.79 | $ 0.61 | $ 2.25 | $ 0.77 | $ (0.49) | $ 0.30 | $ 0.14 | $ 0.49 | $ 3.03 | $ 0.64 | $ 0.05 | $ 0.37 | $ 4.42 | $ 0.44 | $ 4.10
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in usd) | $ 33,001 | $ 25,454 | $ 93,822 | $ 32,166 | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 184,443 | $ 18,343 | $ 169,459
Weighted average number of common shares during the period (in thousands) | 41,814,000,000 | 41,785,000,000 | 41,762,000,000 | 41,610,000,000 | 41,596,000,000 | 41,683,000,000 | 41,600,000,000 | 41,497,000,000 | 41,419,000,000 | 41,433,000,000 | 41,368,000,000 | 41,135,000,000 | 41,737,876 | 41,570,492 | 41,364,546
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  | 79,000 | 100,000 | 112,000
CSUs related to deferred compensation for employees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 25,000 | 25,000
RSUs related to incentive compensation |  |  |  |  |  |  |  |  |  |  |  |  | 132,000 | 199,000 | 63,000
Total common and common equivalent shares adjusted to calculate diluted earnings per share (in thousands) | 42,093,000,000 | 42,030,000,000 | 41,921,000,000 | 41,785,000,000 | 41,911,000,000 | 41,850,000,000 | 41,735,000,000 | 41,653,000,000 | 41,718,000,000 | 41,575,000,000 | 41,493,000,000 | 41,342,000,000 | 41,948,531 | 41,894,232 | 41,564,979
Net income per share - diluted (in usd per share) | $ 0.78 | $ 0.60 | $ 2.24 | $ 0.77 | $ (0.49) | $ 0.30 | $ 0.14 | $ 0.48 | $ 3.00 | $ 0.64 | $ 0.05 | $ 0.37 | $ 4.40 | $ 0.44 | $ 4.08

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