Derivatives Notional Amounts - Designated as Hedges (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount	$ 74,478	$ 83,942
Unrealized Gain (Loss)	(144)	(548)
USD / AUD
Derivative [Line Items]
Notional Amount	342	1,250
Unrealized Gain (Loss)	54	65
USD / CAD
Derivative [Line Items]
Notional Amount	1,106	3,570
Unrealized Gain (Loss)	(154)	(63)
USD / CNY
Derivative [Line Items]
Notional Amount	3,481	0
Unrealized Gain (Loss)	(69)	0
USD / CHF
Derivative [Line Items]
Notional Amount	21	111
Unrealized Gain (Loss)	0	0
USD / EUR
Derivative [Line Items]
Notional Amount	41,227	25,524
Unrealized Gain (Loss)	1,230	0
USD / GBP
Derivative [Line Items]
Notional Amount	322	1,199
Unrealized Gain (Loss)	6	3
USD / NZD
Derivative [Line Items]
Notional Amount	4,149	7,018
Unrealized Gain (Loss)	(156)	(55)
USD / SEK
Derivative [Line Items]
Notional Amount	68	594
Unrealized Gain (Loss)	8	1
USD / MXP
Derivative [Line Items]
Notional Amount	7,552	10,297
Unrealized Gain (Loss)	(523)	(657)
EUR / AUD
Derivative [Line Items]
Notional Amount	0	452
Unrealized Gain (Loss)	0	5
EUR / CAD
Derivative [Line Items]
Notional Amount	141	580
Unrealized Gain (Loss)	3	(1)
EUR / CHF
Derivative [Line Items]
Notional Amount	89	505
Unrealized Gain (Loss)	8	(2)
EUR / DKK
Derivative [Line Items]
Notional Amount	133	643
Unrealized Gain (Loss)	0	(3)
EUR / GBP
Derivative [Line Items]
Notional Amount	7,313	11,906
Unrealized Gain (Loss)	(439)	23
EUR / SEK
Derivative [Line Items]
Notional Amount	590	2,917
Unrealized Gain (Loss)	9	(9)
EUR / NOK
Derivative [Line Items]
Notional Amount	378	1,490
Unrealized Gain (Loss)	27	43
EUR / NZD
Derivative [Line Items]
Notional Amount	5,598	7,074
Unrealized Gain (Loss)	(68)	60
AUD / CAD
Derivative [Line Items]
Notional Amount	0	1,538
Unrealized Gain (Loss)	0	30
AUD / CHF
Derivative [Line Items]
Notional Amount	13	93
Unrealized Gain (Loss)	2	1
AUD / NZD
Derivative [Line Items]
Notional Amount	115	537
Unrealized Gain (Loss)	0	19
AUD / SEK
Derivative [Line Items]
Notional Amount	13	61
Unrealized Gain (Loss)	1	(1)
CAD / SEK
Derivative [Line Items]
Notional Amount	39	182
Unrealized Gain (Loss)	0	(1)
GBP / AUD
Derivative [Line Items]
Notional Amount	0	656
Unrealized Gain (Loss)	0	22
GBP / CHF
Derivative [Line Items]
Notional Amount	101	331
Unrealized Gain (Loss)	1	(1)
GBP / SEK
Derivative [Line Items]
Notional Amount	723	1,035
Unrealized Gain (Loss)	(66)	(2)
DKK / CHF
Derivative [Line Items]
Notional Amount	71	269
Unrealized Gain (Loss)	(8)	(2)
DKK / SEK
Derivative [Line Items]
Notional Amount	513	2,497
Unrealized Gain (Loss)	(23)	(44)
NOK / CHF
Derivative [Line Items]
Notional Amount	18	66
Unrealized Gain (Loss)	3	2
NOK / SEK
Derivative [Line Items]
Notional Amount	362	1,547
Unrealized Gain (Loss)	$ 10	$ 19