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Share-based compensation - Non-vested Restricted Shares - Additional Information (Details) - Non-Vested Restricted Shares - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation	$ 40,562		$ 40,562
Compensation expense	$ 3,005	$ 1,530	$ 4,774	$ 3,072
Independent Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted			19,260	50,000
Management
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted			203,575	45,000
Management | Each yearly anniversary from the date of the agreement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option vesting percentage			20.00%	20.00%

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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Net number of non-option equity instruments granted to participants.

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Percentage of vesting of award under share-based payment arrangement.

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