Compensation plans - Equity-based compensation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Less amounts capitalized	$ (1,583)	$ (3,418)	$ (4,470)
Equity-based compensation	16,028	9,207	8,290
Share-settled
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	9,258	11,635	12,760
Less amounts capitalized	(1,583)	(3,418)	(4,470)
Equity-based compensation	7,675	8,217	8,290
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	7,594	8,839	13,169
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	1,482	2,545	(1,250)
Outperformance share award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	175	174	101
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	7	77	740
Cash-settled
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	8,718	1,153	0
Less amounts capitalized	(365)	(163)	0
Equity-based compensation	8,353	990	0
Performance unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	7,480	749	0
Phantom unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-settled equity-based compensation, gross	$ 1,238	$ 404	$ 0

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

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