Derivatives - Contracts Held (Details) - Not designated as hedging instrument	12 Months Ended
	Dec. 31, 2017 USD ($) $ / € ¥ / $ $ / R$	Dec. 31, 2016 USD ($) $ / € ¥ / $ $ / R$
Euro | Foreign Currency Exchange Contract
Derivative [Line Items]
Notional Value	$ 17,000,000	$ 18,000,000
Forward Rate | $ / €	1.1858	1.0513
Unrealized Gain/(Loss) Recorded at Balance Sheet Date	$ (220,000)	$ (61,000)
Chinese Yuan Renminbi | Foreign Currency Exchange Contract, One
Derivative [Line Items]
Notional Value	$ 20,000,000	$ 25,000,000
Forward Rate | ¥ / $	6.6481	6.7230
Unrealized Gain/(Loss) Recorded at Balance Sheet Date	$ (410,000)	$ (974,000)
Chinese Yuan Renminbi | Foreign Exchange Forward, Contract Three
Derivative [Line Items]
Notional Value		$ 10,000,000
Forward Rate | ¥ / $		6.6757
Unrealized Gain/(Loss) Recorded at Balance Sheet Date		$ (457,000)
USD | Foreign Currency Exchange Contract, Two
Derivative [Line Items]
Notional Value	$ 2,500,000.0	$ 2,000,000
Forward Rate | $ / R$	3.2350	3.4775
Unrealized Gain/(Loss) Recorded at Balance Sheet Date	$ 65,000	$ (131,000)
USD | Foreign Exchange Forward, Contract Four
Derivative [Line Items]
Notional Value		$ 4,000,000
Forward Rate | $ / R$		3.2316
Unrealized Gain/(Loss) Recorded at Balance Sheet Date		$ 39,000