Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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- 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).

+ References

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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).

+ References

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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

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.

+ References

No definition available.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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Stock-based Compensation - Performance-based RSUs (Details) - $ / shares			3 Months Ended	12 Months Ended
	Mar. 25, 2019	Feb. 17, 2019	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee's requisite service period			4 years
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)			958,825	978,851	925,578
Fair value per share at the time of grant (in dollars per share)			$ 7.88	$ 6.35	$ 6.55
Outstanding units, nonvested (in shares)			2,253,181	1,451,507	1,154,980	509,894
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)	147,954	97,087
Vesting period		2 years
Fair value per share at the time of grant (in dollars per share)	$ 4.05	$ 10.75
Expected term (in years)	3 years	3 years
Performance Shares [Member] \| Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year	6 months
Vesting percentage (as a percent)	20.00%	25.00%
Performance Shares [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years	6 months
Vesting percentage (as a percent)	80.00%	25.00%
Performance Shares [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		6 months
Vesting percentage (as a percent)		25.00%
Performance Shares [Member] \| Share-based Payment Arrangement, Tranche Four [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		6 months
Vesting percentage (as a percent)		25.00%