Derivatives Notional Amounts - Designated as Hedges (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount	$ 67,958	$ 213,164
Unrealized Gain (Loss)	948	2,183
USD / AUD
Derivative [Line Items]
Notional Amount	1,848	2,910
Unrealized Gain (Loss)	(68)	(83)
USD / CAD
Derivative [Line Items]
Notional Amount	2,860	3,893
Unrealized Gain (Loss)	139	181
USD / CNY
Derivative [Line Items]
Notional Amount	8,440	16,786
Unrealized Gain (Loss)	(97)	(282)
USD / EUR
Derivative [Line Items]
Notional Amount	20,380	72,758
Unrealized Gain (Loss)	(175)	2,681
USD / GBP
Derivative [Line Items]
Notional Amount	470	3,862
Unrealized Gain (Loss)	64	22
USD / NZD
Derivative [Line Items]
Notional Amount	1,205	4,893
Unrealized Gain (Loss)	10	37
USD / SEK
Derivative [Line Items]
Notional Amount	1,156	5,128
Unrealized Gain (Loss)	(2)	39
USD / MXP
Derivative [Line Items]
Notional Amount	8,015	8,494
Unrealized Gain (Loss)	(271)	(284)
EUR / AUD
Derivative [Line Items]
Notional Amount	172	669
Unrealized Gain (Loss)	(9)	(10)
EUR / CAD
Derivative [Line Items]
Notional Amount	55	1,283
Unrealized Gain (Loss)	6	(17)
EUR / CHF
Derivative [Line Items]
Notional Amount	615	1,944
Unrealized Gain (Loss)	(16)	(17)
EUR / GBP
Derivative [Line Items]
Notional Amount	8,845	36,567
Unrealized Gain (Loss)	1,151	(424)
EUR / SEK
Derivative [Line Items]
Notional Amount	509	2,464
Unrealized Gain (Loss)	9	(42)
EUR / NOK
Derivative [Line Items]
Notional Amount	760	3,375
Unrealized Gain (Loss)	(10)	(55)
EUR / NZD
Derivative [Line Items]
Notional Amount	1,328	3,609
Unrealized Gain (Loss)	248	476
AUD / NZD
Derivative [Line Items]
Notional Amount	90	352
Unrealized Gain (Loss)	4	8
GBP / AUD
Derivative [Line Items]
Notional Amount	214	830
Unrealized Gain (Loss)	(48)	(46)
GBP / CHF
Derivative [Line Items]
Notional Amount	146	463
Unrealized Gain (Loss)	20	(7)
GBP / SEK
Derivative [Line Items]
Notional Amount	562	2,067
Unrealized Gain (Loss)	77	(1)
DKK / SEK
Derivative [Line Items]
Notional Amount	9,358	37,293
Unrealized Gain (Loss)	(41)	46
NOK / SEK
Derivative [Line Items]
Notional Amount	930	3,524
Unrealized Gain (Loss)	$ (43)	$ (39)