Financial Instruments and Fair Value Measurements - Schedule of Fair Value Measurement Information about Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Term loans	$ 992,000	$ 1,000,000
Capital lease obligations	7,127	5,839
Notes payable	1,111	1,159
Long-term Debt	971,043	972,959
Carrying Amount [Member]
Debt Instrument [Line Items]
Long-term Debt	1,000,238	1,006,998
Carrying Amount [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Term loans	992,000	1,000,000
Carrying Amount [Member] \| Level 3 [Member]
Debt Instrument [Line Items]
Capital lease obligations	7,127	5,839
Notes payable	1,111	1,159
Fair Value [Member]
Debt Instrument [Line Items]
Long-term Debt	960,538	1,006,998
Fair Value [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Term loans	952,300	1,000,000
Fair Value [Member] \| Level 3 [Member]
Debt Instrument [Line Items]
Capital lease obligations	7,127	5,839
Notes payable	$ 1,111	$ 1,159

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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