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Derivative Instruments and Hedging Activities Open Foreign Currency Contracts (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Currency Swedish Krone [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Currency, Australian Dollar
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Currency, Canadian Dollar
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Currency, Japanese Yen
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Currency, Mexican Peso
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Norwegian Krone
Derivative [Line Items]                
Notional Amounts (in US Dollars)   $ 87,077 $ 9,230 $ 5,723 $ 26,155 $ 21,627 $ 23,401 $ 941
Derivative, Fair Value, Net $ 21 $ 904 $ (165) $ (86) $ 1,399 $ (591) $ 351 $ (4)