v3.19.1

Stock incentive plans - Restricted stock unit awards (Details) - $ / shares	1 Months Ended	3 Months Ended
	Feb. 28, 2019	Mar. 31, 2019
Stock incentive plans
Shares of common stock issued resulting from vesting		1,306,000
RSUs
Number of Shares
Non-vested at beginning of period (in shares)		3,119,000
Granted (in shares)		517,000
Vested (in shares)		(2,656,000)
Canceled/forfeited (in shares)		(10,000)
Non vested at end of period (in shares)		970,000
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)		$ 8.60
Granted (in dollars per share)		23.36
Vested (in dollars per share)		6.58
Canceled/forfeited (in dollars per share)		25.51
Non vested at end of period (in dollars per share)		$ 21.80
Service-based restricted stock unit awards | Executive And Non Executive Member | Maximum
Stock incentive plans
Vesting period		3 years
Service-based restricted stock unit awards | Non-employee directors and existing members
Stock incentive plans
Vesting period		1 year
Service-based restricted stock unit awards | Non-employee directors and new members
Stock incentive plans
Vesting percentage when the individual completes 12 months of continuous service		33.30%
Vesting period		3 years
Performance-based restricted stock unit awards
Stock incentive plans
Vesting period		3 years
Number of Shares
Granted (in shares)	29,000
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 11.94
Performance-based restricted stock unit awards | Minimum
Stock incentive plans
Performance objective threshold (as a percent)		50.00%
Performance-based restricted stock unit awards | Maximum
Stock incentive plans
Performance objective threshold (as a percent)		150.00%

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Represents the percentage of stock awards vesting each year.

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The percentage of performance objectives threshold for target number of equity instruments other than options under stock-based compensation arrangement.

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