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Capital structure - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	Sep. 30, 2019	Aug. 31, 2019	Jan. 31, 2019	Apr. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 29, 2020
Capital structure
Number of shares issued in transaction (in shares)	2,475,248		7,563,725		542,470	63,926
Price per share (in USD per share)	$ 40.40		$ 30.20		$ 53.37
Consideration received on transaction	$ 97,000		$ 224,200		$ 28,100	$ 2,600
Issuance of common stock related to equity offering (in shares)				4,600,000
Share price (in USD per share)				$ 27.04
Net proceeds from public offerings				$ 117,900	$ 28,092	$ 323,756	$ 117,916
Common stock, authorized shares (in shares)					125,000,000	125,000,000
Issuance of common stock related to rights exchange					$ 150,528
Issuance of common stock related to acquisition					$ 42,869		$ 155,860
Common stock
Capital structure
Common stock, authorized shares (in shares)					125,000,000
Over-Allotment Option
Capital structure
Number of shares issued in transaction (in shares)			843,725
Issuance of common stock related to equity offering (in shares)				600,000
Number of shares under option to purchase that was not exercised	371,287
Option period to purchase stock	30 days
Maximum
Capital structure
Aggregate value of remaining shares to be issued and sold					$ 93,000
Maximum | Common stock
Capital structure
Consideration received on transaction		$ 125,000
Weighted Average
Capital structure
Price per share (in USD per share)						$ 46.60
Censa
Capital structure
Issuance of common stock related to acquisition (in shares)					845,364
Issuance of common stock related to acquisition					$ 42,900
Rights Exchange Agreement
Capital structure
Shares issued under Rights Exchange Agreement					2,821,176			2,821,176
Issuance of common stock related to rights exchange (in shares)					2,821,176
Issuance of common stock related to rights exchange					$ 150,500

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