Derivative Financial Instruments (Schedule of Fair Values of the Company's Derivative Instruments and the Line Items on the Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Gross Amounts of recognized assets	$ 859	$ 786
Gross Amounts of recognized liabilities	165	368
Prepaid expenses and other current assets | Derivative assets not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gross Amounts of recognized assets	841	784
Prepaid expenses and other current assets | Derivative assets designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gross Amounts of recognized assets	18	2
Other accrued liabilities | Derivative assets not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gross Amounts of recognized liabilities	140	331
Other accrued liabilities | Derivative assets designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gross Amounts of recognized liabilities	$ 25	$ 37