Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Value of input used to measure alternative investment.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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The number of derivative instruments of a particular group held by the entity.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Fair Value of Financial Instruments (Details)	12 Months Ended
Fair Value of Financial Instruments (Details)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 18, 2017 USD ($)	Mar. 31, 2016 derivative_instrument
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Debt Securities, Available-for-sale [Line Items]
Notional value	$ 168,000,000
Weighted average maturity	2 months
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of foreign currency contract, net	$ 400,000
Designated as Hedging Instrument \| Interest Rate Swap
Debt Securities, Available-for-sale [Line Items]
Notional value	$ 40,000,000.0
Weighted average maturity	1 year 2 months 15 days
Number of interest rate swaps \| derivative_instrument				2
Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, net	$ 1,100,000
Prepaid Expenses and Other Current Assets \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of foreign currency contract, net	100,000
Prepaid Expenses and Other Current Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position	500,000
Accrued Liabilities \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of foreign currency contract, net	500,000
Other Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position	600,000
Six hundred million senior unsecured notes
Debt Securities, Available-for-sale [Line Items]
Carrying value	600,000,000	$ 600,000,000
Six hundred million senior unsecured notes \| Level 3
Debt Securities, Available-for-sale [Line Items]
Fair value	519,900,000	$ 590,600,000
Maco
Debt Securities, Available-for-sale [Line Items]
Contingent consideration			$ 15,100,000
Maco \| Level 3
Debt Securities, Available-for-sale [Line Items]
Contingent consideration	$ 15,100,000
Measurement Input, Revenue Multiple \| Maco
Debt Securities, Available-for-sale [Line Items]
Revenue Multiple			2.5
Minimum \| Maco
Debt Securities, Available-for-sale [Line Items]
Contingent consideration			$ 0
Maximum \| Maco
Debt Securities, Available-for-sale [Line Items]
Contingent consideration			$ 15,100,000