Derivative Instruments and Hedging Activities Open Foreign Currency Contracts (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2014 Cash Flow Hedging [Member] Foreign Exchange Contract [Member]	Jun. 30, 2014 Cash Flow Hedging [Member] Foreign Exchange Contract [Member] Currency, Australian Dollar	Jun. 30, 2014 Cash Flow Hedging [Member] Foreign Exchange Contract [Member] Currency, Canadian Dollar	Jun. 30, 2014 Cash Flow Hedging [Member] Foreign Exchange Contract [Member] Currency, Japanese Yen	Jun. 30, 2014 Cash Flow Hedging [Member] Foreign Exchange Contract [Member] Currency, Mexican Peso
Derivative [Line Items]
Notional Amounts (in US Dollars)		$ 183,292	$ 6,303	$ 149,554	$ 11,770	$ 15,665
Derivative, Fair Value, Net	$ 21	$ (1,608)	$ (156)	$ (1,711)	$ (177)	$ 436