Number of shares that have been withheld for net settlement of equity awards during the period.

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The amount of cash paid during the current period to taxes paid for net settlement of stock-settled bonus.

+ References

No definition available.

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

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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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- Definition

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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- Definition

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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- Definition

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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- Definition

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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

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

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- Definition

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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- Definition

Number of new stock issued during the period.

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Share Based Awards - RSUs and Bonus Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted							9,329,181
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus					$ 5,892	$ 4,862	$ 3,149
Stock-based compensation expense					$ 35,804	$ 38,436	$ 33,731
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning Balance	12,639,066	12,303,913	12,906,030	10,474,975	12,303,913	12,906,030	10,474,975
Granted					10,403,571	10,224,832	11,017,278
Vested					(7,406,628)	(7,032,521)	(5,964,422)
Cancelled/Forfeited					(2,661,790)	(3,794,428)	(2,621,801)
Unvested, Ending Balance					12,639,066	12,303,913	12,906,030
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, Beginning Balance	$ 5.20	$ 4.63	$ 4.72	$ 4.45	$ 4.63	$ 4.72	$ 4.45
Granted (in dollars per share)					5.45	4.63	5.04
Vested (in dollars per share)					4.75	4.88	4.70
Cancelled/Forfeited (in dollars per share)					4.79	4.48	5.01
Unvested, Ending Balance					$ 5.20	$ 4.63	$ 4.72
Share withholding					1,147,904	1,294,360
2016 Bonus Plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted							1,688,097
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus				$ 3,100
Stock-based compensation expense							$ 1,700
2016 Bonus Plans \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Common stock issued (in shares)				1,010,550
Share withholding				677,547
2017 Bonus Plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted						1,974,771
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus			$ 3,700
Stock-based compensation expense						$ 1,900	$ 7,700
2017 Bonus Plans \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Common stock issued (in shares)			1,220,822
Share withholding			752,564
2018 Bonus Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus		$ 4,100
Stock-based compensation expense					$ 1,100	$ 9,400
2018 Bonus Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Common stock issued (in shares)		1,338,220
Share withholding		832,635
2019 Bonus Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Stock-based compensation expense					$ 6,900
2019 Bonus Plan \| Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Common stock issued (in shares)	1,061,165
Share withholding	669,517
Taxes paid for net settlement of stock-settled bonus	$ 2,900