Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

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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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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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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The estimated fair value of the debt instrument as percentage of the respective principal balance outstanding.

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Fair Value Measurement (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Carrying amounts and estimated fair values of financial instruments
Goodwill	$ 358,880	$ 359,771	$ 708,258
Senior secured term loan
Assets and liabilities measured at fair value
Fair value percentage	30.00%
Senior secured notes
Assets and liabilities measured at fair value
Fair value percentage	24.00%
Level 3
Reconciliation of net assets and liabilities
Balance as of Beginning of Period	$ 721	721
Payments/Reductions
Balance as of End of Period	721	721
Carrying Amount \| Recurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Long-term debt	1,520,619	1,398,385
Interest rate swap	1,346	501
Acquisition contingent liability	721	721
Carrying Amount \| Nonrecurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Goodwill	358,880	359,771
Fair Value \| Recurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Long-term debt	535,387	632,796
Interest rate swap	1,346	501
Acquisition contingent liability	721	721
Fair Value \| Recurring assets and liabilities \| Level 2
Carrying amounts and estimated fair values of financial instruments
Long-term debt	535,387	632,796
Interest rate swap	1,346	501
Fair Value \| Recurring assets and liabilities \| Level 3
Carrying amounts and estimated fair values of financial instruments
Acquisition contingent liability	721	721
Fair Value \| Nonrecurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Goodwill	358,880	359,771
Fair Value \| Nonrecurring assets and liabilities \| Level 3
Carrying amounts and estimated fair values of financial instruments
Goodwill	$ 358,880	$ 359,771