Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration accrual	$ 16,851	$ 38,266
Acquisition related contingent consideration	4,963	0
Gain on fair value adjustment	21,900
Foreign exchange losses	500
Additional obligations	3,721	9,914
Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term notes	305,700
Senior Notes 5.50 Percent Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term notes	311,900
Interest Rate Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap and cap contracts	10,638	19,805
Liabilities associated with interest rate swap and foreign currency forward contracts	17,420	$ 3,290
Foreign Exchange Forward
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities associated with interest rate swap and foreign currency forward contracts	$ 7,868

Amount of asset retirement obligations incurred during the period.

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

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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