Derivatives - Notional Amounts - Not Designated as Hedges (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 40,165,000	$ 79,973,000
Gain (Loss)	(54,000)	(1,458,000)
Foreign exchange forward
Derivative [Line Items]
Gain (Loss)	1,112,000	338,000	$ (271,000)
Foreign exchange forward | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain (Loss)	(54,000)	(1,458,000)
AUD / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	8,051,000	7,300,000
Gain (Loss)	337,000	117,000
CAD / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	5,762,000	6,016,000
Gain (Loss)	(4,000)	(6,000)
CNY / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	9,943,000	3,200,000
Gain (Loss)	(441,000)	(14,000)
EUR / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	2,118,000	53,365,000
Gain (Loss)	53,000	(1,585,000)
DKK / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	7,927,000	0
Gain (Loss)	125,000	0
GBP / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	4,526,000	5,592,000
Gain (Loss)	(106,000)	18,000
NZD / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	0	4,500,000
Gain (Loss)	0	12,000
NOK / USD | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	1,838,000	0
Gain (Loss)	$ (18,000)	$ 0