Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance lease obligation	$ 2,373	$ 3,231
Total	732,373	563,231
Term Loan Credit Facility Unamortized Debt Issuance Costs	(925)	(979)
Long-term Debt	731,448	562,252
Finance Lease Obligation Due Within One Year	(2,128)	(3,231)
Long-Term Debt	729,320	559,021
Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Long-term debt	$ 230,000	$ 60,000
Interest Rate	3.66%	3.67%
Term Loan Credit Facility, due July 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 500,000	$ 500,000
Interest Rate	3.41%	3.42%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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

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- Definition

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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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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- Definition

The effective interest rate during the reporting period.

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- Definition

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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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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- Definition

Amount of long-term debt and capital lease obligations including current maturities.

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No definition available.

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