Financial Instruments and Fair Value Measurements - Interest Rate Swaps (Details) - USD ($)			3 Months Ended		6 Months Ended
	Mar. 29, 2019	Feb. 28, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 19, 2019	Dec. 31, 2018	Feb. 07, 2017
Derivative [Line Items]
Change in fair value of interest rate swap			$ (6,900,000)	$ 1,400,000	$ (10,600,000)	$ 5,100,000
Interest Rate Swap
Derivative [Line Items]
Term	5 years	5 years
Notional amount							$ 130,000,000.0		$ 250,000,000.0
Fixed swap rate							2.43%		1.89%
Cash flow hedge ineffectiveness recorded in earnings					0
Prepaid Expenses and Other Current Assets | Interest Rate Swap
Derivative [Line Items]
Interest rate swap assets			0		0			$ 4,300,000
Other Long Term Liabilities | Interest Rate Swap
Derivative [Line Items]
Interest rate swap liabilities			(6,200,000)		(6,200,000)			$ 0
Interest Expense | Interest Rate Swap
Derivative [Line Items]
Interest income (expense) on interest rate swap			(400,000)	0	(800,000)	200,000
Other Comprehensive Income (Loss) | Interest Rate Swap
Derivative [Line Items]
Change in fair value of interest rate swap			$ (6,900,000)	$ 1,400,000	$ (10,600,000)	$ 5,100,000