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Long-term debt - Additional Required Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
2027 Notes
Debt Instrument [Line Items]
Interest expense	$ 32,175	$ 20,269	$ 15,569
DFC amortization	758	402	299
Amortization of premium/discount, net	805	133	0
2023 Notes
Debt Instrument [Line Items]
Interest expense	13,768	20,882	23,060
DFC amortization	224	294	323
Amortization of premium/discount, net	$ 287	$ 371	$ 402

X

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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