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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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)
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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.

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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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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	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Carrying amounts and estimated fair values of financial instruments
Goodwill	$ 708,246	$ 708,258	$ 747,325
Senior secured term loan
Assets and liabilities measured at fair value
Fair value percentage	84.80%
Senior secured notes
Assets and liabilities measured at fair value
Fair value percentage	81.00%
Level 3
Reconciliation of net assets and liabilities
Balance at end of period	$ 721	721	$ 721
Carrying Amount \| Recurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Long-term debt	1,331,898	1,306,423
Interest rate swap	549	3,836
Goodwill	708,246	708,258
Carrying Amount \| Nonrecurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Acquisition contingent liability	721	721
Fair Value \| Recurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Long-term debt	1,133,899	1,316,306
Interest rate swap	549	3,836
Goodwill	708,246	708,258
Fair Value \| Recurring assets and liabilities \| Level 2
Carrying amounts and estimated fair values of financial instruments
Long-term debt	1,133,899	1,316,306
Interest rate swap	549	3,836
Fair Value \| Recurring assets and liabilities \| Level 3
Carrying amounts and estimated fair values of financial instruments
Goodwill	708,246	708,258
Fair Value \| Nonrecurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Acquisition contingent liability	721	721
Fair Value \| Nonrecurring assets and liabilities \| Level 3
Carrying amounts and estimated fair values of financial instruments
Acquisition contingent liability	$ 721	$ 721