Derivatives Notional Amounts - Designated as Hedges (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount	$ 72,847	$ 83,942
Unrealized Gain (Loss)	486	(548)
USD / AUD
Derivative [Line Items]
Notional Amount	536	1,250
Unrealized Gain (Loss)	44	65
USD / CAD
Derivative [Line Items]
Notional Amount	2,226	3,570
Unrealized Gain (Loss)	(182)	(63)
USD / CNY
Derivative [Line Items]
Notional Amount	6,976	0
Unrealized Gain (Loss)	(5)	0
USD / CHF
Derivative [Line Items]
Notional Amount	42	111
Unrealized Gain (Loss)	(1)	0
USD / EUR
Derivative [Line Items]
Notional Amount	28,570	25,524
Unrealized Gain (Loss)	2,757	0
USD / GBP
Derivative [Line Items]
Notional Amount	636	1,199
Unrealized Gain (Loss)	14	3
USD / NZD
Derivative [Line Items]
Notional Amount	3,551	7,018
Unrealized Gain (Loss)	(188)	(55)
USD / SEK
Derivative [Line Items]
Notional Amount	183	594
Unrealized Gain (Loss)	23	1
USD / MXP
Derivative [Line Items]
Notional Amount	5,090	10,297
Unrealized Gain (Loss)	(577)	(657)
EUR / AUD
Derivative [Line Items]
Notional Amount	215	452
Unrealized Gain (Loss)	(7)	5
EUR / CAD
Derivative [Line Items]
Notional Amount	276	580
Unrealized Gain (Loss)	(14)	(1)
EUR / CHF
Derivative [Line Items]
Notional Amount	259	505
Unrealized Gain (Loss)	36	(2)
EUR / DKK
Derivative [Line Items]
Notional Amount	281	643
Unrealized Gain (Loss)	(1)	(3)
EUR / GBP
Derivative [Line Items]
Notional Amount	14,645	11,906
Unrealized Gain (Loss)	(1,148)	23
EUR / SEK
Derivative [Line Items]
Notional Amount	1,242	2,917
Unrealized Gain (Loss)	3	(9)
EUR / NOK
Derivative [Line Items]
Notional Amount	727	1,490
Unrealized Gain (Loss)	(4)	43
EUR / NZD
Derivative [Line Items]
Notional Amount	3,146	7,074
Unrealized Gain (Loss)	(81)	60
AUD / CAD
Derivative [Line Items]
Notional Amount	0	1,538
Unrealized Gain (Loss)	0	30
AUD / CHF
Derivative [Line Items]
Notional Amount	28	93
Unrealized Gain (Loss)	3	1
AUD / NZD
Derivative [Line Items]
Notional Amount	253	537
Unrealized Gain (Loss)	(10)	19
AUD / SEK
Derivative [Line Items]
Notional Amount	29	61
Unrealized Gain (Loss)	(1)	(1)
CAD / SEK
Derivative [Line Items]
Notional Amount	94	182
Unrealized Gain (Loss)	(6)	(1)
GBP / AUD
Derivative [Line Items]
Notional Amount	312	656
Unrealized Gain (Loss)	30	22
GBP / CHF
Derivative [Line Items]
Notional Amount	207	331
Unrealized Gain (Loss)	9	(1)
GBP / SEK
Derivative [Line Items]
Notional Amount	1,430	1,035
Unrealized Gain (Loss)	(138)	(2)
DKK / CHF
Derivative [Line Items]
Notional Amount	144	269
Unrealized Gain (Loss)	(21)	(2)
DKK / SEK
Derivative [Line Items]
Notional Amount	1,010	2,497
Unrealized Gain (Loss)	(30)	(44)
NOK / CHF
Derivative [Line Items]
Notional Amount	36	66
Unrealized Gain (Loss)	5	2
NOK / SEK
Derivative [Line Items]
Notional Amount	703	1,547
Unrealized Gain (Loss)	$ (24)	$ 19