Derivatives and Risk Management (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total asset derivatives	$ 1,213	$ 236
Total liability derivatives	3,846	5,392
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Total liability derivatives	1,977	2,219
Derivatives Designated as Hedging Instruments | Prepaid expenses and other current assets | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Total liability derivatives	1,201
Derivatives Designated as Hedging Instruments | Accrued liabilities | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Total liability derivatives	385	536
Derivatives Designated as Hedging Instruments | Accrued liabilities | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Total liability derivatives	257	1,354
Derivatives Designated as Hedging Instruments | Other long-term liabilities | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Total liability derivatives	134	329
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Total asset derivatives	1,213	236
Total liability derivatives	1,869	3,173
Derivatives Not Designated as Hedging Instruments | Prepaid expenses and other current assets | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Total asset derivatives	1,213	236
Derivatives Not Designated as Hedging Instruments | Accrued liabilities | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Total liability derivatives	$ 1,869	$ 3,173