Derivatives - Notional Amounts - Designated as Hedges (Details) (Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Amount	$ 83,942	$ 135,009
Unrealized Gain (Loss)	(548)	(781)
USD / AUD
Derivative [Line Items]
Notional Amount	1,250	0
Unrealized Gain (Loss)	65	0
USD / CAD
Derivative [Line Items]
Notional Amount	3,570	0
Unrealized Gain (Loss)	(63)	0
USD / CHF
Derivative [Line Items]
Notional Amount	111	486
Unrealized Gain (Loss)	0	4
USD / CNY
Derivative [Line Items]
Notional Amount	0	11,730
Unrealized Gain (Loss)	0	(66)
USD / EUR
Derivative [Line Items]
Notional Amount	25,524	51,106
Unrealized Gain (Loss)	0	(168)
USD / GBP
Derivative [Line Items]
Notional Amount	1,199	2,686
Unrealized Gain (Loss)	3	(45)
USD / NZD
Derivative [Line Items]
Notional Amount	7,018	0
Unrealized Gain (Loss)	(55)	0
USD / SEK
Derivative [Line Items]
Notional Amount	594	2,485
Unrealized Gain (Loss)	1	58
USD / MXP
Derivative [Line Items]
Notional Amount	10,297	5,960
Unrealized Gain (Loss)	(657)	102
EUR / AUD
Derivative [Line Items]
Notional Amount	452	0
Unrealized Gain (Loss)	5	0
EUR / CAD
Derivative [Line Items]
Notional Amount	580	1,710
Unrealized Gain (Loss)	(1)	(1)
EUR / CHF
Derivative [Line Items]
Notional Amount	505	2,654
Unrealized Gain (Loss)	(2)	1
EUR / DKK
Derivative [Line Items]
Notional Amount	643	1,382
Unrealized Gain (Loss)	(3)	(5)
EUR / GBP
Derivative [Line Items]
Notional Amount	11,906	29,614
Unrealized Gain (Loss)	23	(501)
EUR / NOK
Derivative [Line Items]
Notional Amount	1,490	3,135
Unrealized Gain (Loss)	43	66
EUR / SEK
Derivative [Line Items]
Notional Amount	2,917	3,432
Unrealized Gain (Loss)	(9)	75
EUR / NZD
Derivative [Line Items]
Notional Amount	7,074	6,959
Unrealized Gain (Loss)	60	(111)
GBP / AUD
Derivative [Line Items]
Notional Amount	656	0
Unrealized Gain (Loss)	22	0
GBP / CHF
Derivative [Line Items]
Notional Amount	331	837
Unrealized Gain (Loss)	(1)	(26)
GBP / SEK
Derivative [Line Items]
Notional Amount	1,035	2,078
Unrealized Gain (Loss)	(2)	(101)
AUD / CAD
Derivative [Line Items]
Notional Amount	1,538	0
Unrealized Gain (Loss)	30	0
AUD / CHF
Derivative [Line Items]
Notional Amount	93	0
Unrealized Gain (Loss)	1	0
AUD / NZD
Derivative [Line Items]
Notional Amount	537	0
Unrealized Gain (Loss)	19	0
AUD / SEK
Derivative [Line Items]
Notional Amount	61	0
Unrealized Gain (Loss)	(1)	0
CAD / SEK
Derivative [Line Items]
Notional Amount	182	0
Unrealized Gain (Loss)	(1)	0
CHF / DKK
Derivative [Line Items]
Notional Amount	269	0
Unrealized Gain (Loss)	(2)	0
DKK / SEK
Derivative [Line Items]
Notional Amount	2,497	5,337
Unrealized Gain (Loss)	(44)	(94)
NOK / CHF
Derivative [Line Items]
Notional Amount	66	0
Unrealized Gain (Loss)	2	0
NOK / SEK
Derivative [Line Items]
Notional Amount	1,547	3,418
Unrealized Gain (Loss)	$ 19	$ 31