Derivative Instruments and Hedging Activities Open Foreign Currency Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative, Fair Value, Net	$ 2,599	$ (7,179)
Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	145,006
Derivative, Fair Value, Net	2,767
Australian Dollar | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	20,336
Derivative, Fair Value, Net	(69)
Canadian Dollar | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	81,747
Derivative, Fair Value, Net	5,062
Japanese Yen | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	10,066
Derivative, Fair Value, Net	110
Mexican Peso | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional Amounts (in U.S. dollars)	32,857
Derivative, Fair Value, Net	$ (2,336)