Employee benefit plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 7,637	$ 9,782
ESPP stock issued during period (shares)	556,000	458,000
ESPP weighted average purchase price of shares purchased (usd per share)	$ 3.38	$ 4.96
Unearned stock-based compensation, expected recognition period	2 years 6 months
Share-based Payment Arrangement, Expense, Tax Benefit	$ 0	$ 0
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)	4,231,000
Weighted average price of shares granted (usd per share)	$ 4.08
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)	1,035,000
Weighted average price of shares granted (usd per share)	$ 4.08
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	$ 53,200
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

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Weighted average purchase price of capital shares purchased through an employee stock ownership plan.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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