Derivative Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Apr. 01, 2016
Derivative [Line Items]
Derivative assets	$ 12,700,000		$ 8,900,000
Derivative liabilities	500,000		1,400,000
Gains in AOCI expected to be recognized in earnings over the next twelve months	1,400,000
Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Gain (loss) recognized in income for derivative instruments	$ 0	$ 0
Commodity Price Risk [Member]
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge	24 months
Notional amount	$ 9,500,000		9,200,000
Gain (loss) recognized on hedge ineffective portion	$ 0	$ 0
Foreign Exchange Contracts, Sales and Purchases [Member]
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge	15 months
Notional amount	$ 17,100,000		$ 18,900,000
Interest Rate Swap Contracts [Member] | Term Loan B [Member] | Minimum [Member]
Derivative [Line Items]
LIBOR floor				0.75%