v3.20.4

Stock incentive plans - Compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock incentive plans |  |  |
Total stock-based compensation expense | $ 7,606 | $ 8,596 | $ 12,268
Stock-based compensation expense capitalized | 645 | 860 | 789
Out of period adjustments | 481 |  |
Tax expense from stock-based compensation | $ (659) |  |
Tax benefit from stock based compensation |  | $ 5,915 | $ 4,594

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