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

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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