Derivatives Notional Amounts - Designated as Hedges (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Amount	$ 39,377	$ 135,009
Unrealized Gain (Loss)	(85)	(781)
USD / AUD [Member]
Derivative [Line Items]
Notional Amount	582	0
Unrealized Gain (Loss)	10	0
USD / CNY [Member]
Derivative [Line Items]
Notional Amount	3,242	11,730
Unrealized Gain (Loss)	(24)	(66)
USD / CHF [Member]
Derivative [Line Items]
Notional Amount	97	486
Unrealized Gain (Loss)	2	4
USD / EUR [Member]
Derivative [Line Items]
Notional Amount	14,563	51,106
Unrealized Gain (Loss)	533	(168)
USD / GBP [Member]
Derivative [Line Items]
Notional Amount	604	2,686
Unrealized Gain (Loss)	(19)	(45)
USD / NZD [Member]
Derivative [Line Items]
Notional Amount	1,012	0
Unrealized Gain (Loss)	(19)	0
USD / SEK [Member]
Derivative [Line Items]
Notional Amount	479	2,485
Unrealized Gain (Loss)	37	58
USD / MXP [Member]
Derivative [Line Items]
Notional Amount	2,754	5,960
Unrealized Gain (Loss)	6	102
EUR / AUD [Member]
Derivative [Line Items]
Notional Amount	163	0
Unrealized Gain (Loss)	(11)	0
EUR / CAD [Member]
Derivative [Line Items]
Notional Amount	380	1,710
Unrealized Gain (Loss)	(7)	(1)
EUR / CHF [Member]
Derivative [Line Items]
Notional Amount	718	2,654
Unrealized Gain (Loss)	13	1
EUR / DKK [Member]
Derivative [Line Items]
Notional Amount	306	1,382
Unrealized Gain (Loss)	(1)	(5)
EUR / GBP [Member]
Derivative [Line Items]
Notional Amount	7,603	29,614
Unrealized Gain (Loss)	(529)	(501)
EUR / SEK [Member]
Derivative [Line Items]
Notional Amount	808	3,432
Unrealized Gain (Loss)	48	75
EUR / NOK [Member]
Derivative [Line Items]
Notional Amount	962	3,135
Unrealized Gain (Loss)	(10)	66
EUR / NZD [Member]
Derivative [Line Items]
Notional Amount	1,747	6,959
Unrealized Gain (Loss)	61	(111)
AUD / CAD [Member]
Derivative [Line Items]
Notional Amount	354	0
Unrealized Gain (Loss)	8	0
AUD / NZD [Member]
Derivative [Line Items]
Notional Amount	255	0
Unrealized Gain (Loss)	(13)	0
GBP / CHF [Member]
Derivative [Line Items]
Notional Amount	218	837
Unrealized Gain (Loss)	(14)	(26)
GBP / SEK [Member]
Derivative [Line Items]
Notional Amount	519	2,078
Unrealized Gain (Loss)	(67)	(101)
DKK / SEK [Member]
Derivative [Line Items]
Notional Amount	1,193	5,337
Unrealized Gain (Loss)	(50)	(94)
NOK / SEK [Member]
Derivative [Line Items]
Notional Amount	818	3,418
Unrealized Gain (Loss)	$ (39)	$ 31