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

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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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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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Fair Value Measurement (Details) - USD ($) $ in Thousands	12 Months Ended
Fair Value Measurement (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Carrying amounts and estimated fair values of financial instruments
Goodwill	$ 359,771	$ 708,258	$ 611,982	$ 708,246	$ 708,285	$ 749,762	$ 748,708	$ 747,325	$ 747,325
Reconciliation of net assets and liabilities
Impairment of goodwill	$ 348,557	44,427
Senior secured term loan
Assets and liabilities measured at fair value
Fair value percentage	42.50%
Senior secured notes
Assets and liabilities measured at fair value
Fair value percentage	41.00%
Level 3
Reconciliation of net assets and liabilities
Balance as of Beginning of Period	$ 721	721
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	1,398,385	1,306,423
Interest rate swap	501	3,836
Acquisition contingent liability	721	721
Carrying Amount \| Nonrecurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Goodwill	359,771	708,258
Fair Value \| Recurring assets and liabilities
Carrying amounts and estimated fair values of financial instruments
Long-term debt	632,796	1,316,306
Interest rate swap	501	3,836
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	632,796	1,316,306
Interest rate swap	501	3,836
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	359,771	708,258
Fair Value \| Nonrecurring assets and liabilities \| Level 3
Carrying amounts and estimated fair values of financial instruments
Goodwill	$ 359,771	$ 708,258