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Employee benefit plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 9,339	$ 10,251	$ 9,836	$ 9,329	$ 10,029	$ 8,869
ESPP stock issued during period (shares)							700,000	800,000
ESPP weighted average purchase price of shares purchased (usd per share)							$ 6.72	$ 5.28
Unearned stock-based compensation, expected recognition period							1 year 11 months 26 days
Share-based Payment Arrangement, Expense, Tax Benefit	$ 2,100			$ 2,100			$ 6,500	$ 6,500
Stock Repurchased During Period, Shares	1,540,000	1,802,000	1,120,000
Treasury Stock Acquired, Average Cost Per Share	$ 6.40						$ 7.09
Stock Repurchased During Period, Value	$ 9,856	$ 11,762	$ 10,000				$ 31,618
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)							4,452,000
Weighted average price of shares granted (usd per share)							$ 8.30
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)							604,000
Weighted average price of shares granted (usd per share)							$ 8.70
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase Price of Common Stock, Percent							85.00%
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs	$ 57,300						$ 57,300
2014 Equity Incentive Plans [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration Period							10 years
2014 Equity Incentive Plans [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period							3 years
2014 Equity Incentive Plans [Member] | Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period							1 year
2014 Equity Incentive Plans [Member] | Minimum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period							2 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period							4 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period							4 years

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

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