Derivatives Notional Amounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional Amount of Derivatives, Matured During Period	$ 182,213,000	$ 176,784,000
Gain (Loss)	72,000	1,159,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	34,059,000	65,426,000
Gain (Loss)	370,000	545,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | AUD / USD [Member]
Derivative [Line Items]
Notional Amount	225,000	0
Gain (Loss)	(1,000)	0
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | CAD / USD [Member]
Derivative [Line Items]
Notional Amount	0	22,194,000
Gain (Loss)	0	(90,000)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | EUR / AUD [Member]
Derivative [Line Items]
Notional Amount	2,039,000	1,928,000
Gain (Loss)	80,000	51,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | GBP / AUD [Domain]
Derivative [Line Items]
Notional Amount	0	1,356,000
Gain (Loss)	0	26,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | NOK / AUD [Domain]
Derivative [Line Items]
Notional Amount	0	1,039,000
Gain (Loss)	0	40,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | NZD / AUD [Domain]
Derivative [Line Items]
Notional Amount	0	2,128,000
Gain (Loss)	0	25,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | EUR / USD [Member]
Derivative [Line Items]
Notional Amount	14,867,000	18,060,000
Gain (Loss)	250,000	416,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | CHF / USD [Member]
Derivative [Line Items]
Notional Amount	1,645,000	2,144,000
Gain (Loss)	35,000	42,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | GBP / USD [Domain]
Derivative [Line Items]
Notional Amount	0	3,514,000
Gain (Loss)	0	60,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | NZD / USD [Member]
Derivative [Line Items]
Notional Amount	3,824,000	0
Gain (Loss)	(1,000)	0
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | CAD / AUD [Domain]
Derivative [Line Items]
Notional Amount	5,989,000	1,508,000
Gain (Loss)	10,000	3,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | EUR / DKK [Member]
Derivative [Line Items]
Notional Amount	5,470,000	11,555,000
Gain (Loss)	(3,000)	(28,000)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	135,009,000	108,408,000
Unrealized Gain (Loss)	(781,000)	(540,000)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / CAD [Member]
Derivative [Line Items]
Notional Amount	0	17,620,000
Unrealized Gain (Loss)	0	(6,000)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / CHF [Member]
Derivative [Line Items]
Notional Amount	486,000	0
Unrealized Gain (Loss)	4,000	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / CNY [Member]
Derivative [Line Items]
Notional Amount	11,730,000	0
Unrealized Gain (Loss)	(66,000)	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / EUR [Member]
Derivative [Line Items]
Notional Amount	51,106,000	59,510,000
Unrealized Gain (Loss)	(168,000)	(797,000)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / GBP [Member]
Derivative [Line Items]
Notional Amount	2,686,000	2,519,000
Unrealized Gain (Loss)	(45,000)	(3,000)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / SEK [Member]
Derivative [Line Items]
Notional Amount	2,485,000	0
Unrealized Gain (Loss)	58,000	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | USD / MXP [Member]
Derivative [Line Items]
Notional Amount	5,960,000	6,954,000
Unrealized Gain (Loss)	102,000	141,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / CHF [Member]
Derivative [Line Items]
Notional Amount	2,654,000	0
Unrealized Gain (Loss)	1,000	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / GBP [Member]
Derivative [Line Items]
Notional Amount	29,614,000	2,077,000
Unrealized Gain (Loss)	(501,000)	46,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / NOK [Member]
Derivative [Line Items]
Notional Amount	3,135,000	0
Unrealized Gain (Loss)	66,000	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / SEK [Member]
Derivative [Line Items]
Notional Amount	3,432,000	0
Unrealized Gain (Loss)	75,000	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / NZD [Member]
Derivative [Line Items]
Notional Amount	6,959,000	5,749,000
Unrealized Gain (Loss)	(111,000)	105,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | GBP / CHF [Member]
Derivative [Line Items]
Notional Amount	837,000	0
Unrealized Gain (Loss)	(26,000)	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | GBP / SEK [Member]
Derivative [Line Items]
Notional Amount	2,078,000	4,154,000
Unrealized Gain (Loss)	(101,000)	25,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | DKK / SEK [Member]
Derivative [Line Items]
Notional Amount	5,337,000	6,397,000
Unrealized Gain (Loss)	(94,000)	(47,000)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / CAD [Member]
Derivative [Line Items]
Notional Amount	1,710,000	0
Unrealized Gain (Loss)	(1,000)	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | EUR / DKK [Member]
Derivative [Line Items]
Notional Amount	1,382,000	0
Unrealized Gain (Loss)	(5,000)	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | NOK / SEK [Domain]
Derivative [Line Items]
Notional Amount	3,418,000	3,428,000
Unrealized Gain (Loss)	$ 31,000	$ (4,000)
Minimum [Member]
Derivative [Line Items]
Derivative, Percentage of Forcasted Transactions With Currency Rate Exposure	60.00%
Maximum [Member]
Derivative [Line Items]
Derivative, Percentage of Forcasted Transactions With Currency Rate Exposure	90.00%