Derivative Instruments and Hedging Activities Open Foreign Currency Contracts (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative, Fair Value, Net	$ 21	$ (2,741)
Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in US Dollars)	103,538
Derivative, Fair Value, Net	(9)
Currency Canadian Dollar [Member] | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in US Dollars)	39,744
Derivative, Fair Value, Net	869
Currency Japanese Yen [Member] | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in US Dollars)	17,864
Derivative, Fair Value, Net	(808)
Currency Mexican Peso [Member] | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in US Dollars)	28,422
Derivative, Fair Value, Net	162
Currency, Norwegian Kroner [Member] | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in US Dollars)	1,885
Derivative, Fair Value, Net	21
Currency Swedish Krone [Member] | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in US Dollars)	15,623
Derivative, Fair Value, Net	$ (253)