Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Lowest interest rate, or floor, that may be charged.

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Represents the maximum debt issuance costs for new lenders exceeded 10% test.

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The percent of reduction in interest rate in repricing term loans applicable to the existing senior secured term loans.

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Long-Term Debt and Credit Facilities - Term Loan Repricing (Details) - USD ($) $ in Thousands	Jul. 13, 2018	Mar. 31, 2019	Dec. 31, 2018
Debt instruments
Outstanding amount of term loans		$ 1,368,973	$ 1,335,660
First Amendment
Debt instruments
Proceeds from refinancing term loans	$ 343,400
Reduction in interest rate (in percentage)	1.00%
First Amendment \| Eurodollar
Debt instruments
Floor interest rate	1.00%
First Amendment \| Federal funds rate
Debt instruments
Variable interest rate (as a percent)	0.50%
First Amendment \| LIBOR
Debt instruments
Variable interest rate (as a percent)	6.50%
First Amendment \| One-month adjusted LIBOR
Debt instruments
Variable interest rate (as a percent)	1.00%
First Amendment \| Base rate
Debt instruments
Variable interest rate (as a percent)	5.50%
Senior secured revolving facility
Debt instruments
Outstanding amount of term loans	$ 343,400
Senior secured revolving facility \| First Amendment
Debt instruments
Debt issuance costs	1,000
Amortization expense of debt issuance costs	1,000
Write off of previously recognized debt issuance costs	100
Maximum debt issuance costs for new lenders exceeded 10% test	$ 100