Fair Value Measurements and Derivative Instruments (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Derivative [Line Items]
Total net derivative liabilities	$ 2,713,000		$ 2,713,000		$ (1,651,000)
Total notional amount of outstanding contracts in cash flow hedging relationships	21,000,000		21,000,000		26,000,000
Derivative Gain (Loss) Recognized in AOCI (Effective Portion) - Revenue	387,000	(61,000)	615,000	(402,000)
Revenue
Derivative [Line Items]
Derivative Gain (Loss) Recognized in AOCI (Effective Portion) - Revenue	429,000	(169,000)	1,009,000	(922,000)
Cost of sales
Derivative [Line Items]
Derivative Gain (Loss) Recognized in AOCI (Effective Portion) - Revenue	(42,000)	108,000	(394,000)	520,000
Assets [Member]
Derivative [Line Items]
Total net derivative liabilities	3,090,000		3,090,000		1,358,000
Liability [Member]
Derivative [Line Items]
Total net derivative liabilities	(377,000)		(377,000)		(3,009,000)
Foreign exchange contracts
Derivative [Line Items]
Derivative Gain (Loss) Recognized in AOCI (Effective Portion) - Foreign exchange contracts	959,000	(343,000)	1,465,000	457,000
Foreign exchange contracts | Selling, general and administrative expense
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	3,131,000	(6,798,000)	(173,000)	(12,793,000)
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets and prepayments:
Derivative [Line Items]
Total net derivative liabilities	871,000		871,000		546,000
Foreign exchange contracts | Derivatives designated as hedging instruments | Accounts payable and accrued liabilities:
Derivative [Line Items]
Total net derivative liabilities	0		0		(526,000)
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets and prepayments:
Derivative [Line Items]
Total net derivative liabilities	2,219,000		2,219,000		812,000
Foreign exchange contracts | Derivatives not designated as hedging instruments | Accounts payable and accrued liabilities:
Derivative [Line Items]
Total net derivative liabilities	(377,000)		(377,000)		(2,483,000)
Interest rate swaps | Interest expense
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	863,000	3,631,000
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (2,742,000)	$ (10,969,000)