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Derivatives (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Dec. 31, 2013
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Contracts [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Contracts [Member]
Dec. 31, 2013
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Foreign Exchange Contracts [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Foreign Exchange Contracts [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Apr. 30, 2012
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Bank
Mar. 31, 2011
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Apr. 30, 2012
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Mar. 31, 2011
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Derivatives
Derivative [Line Items]                            
Number of Interest Rate Derivatives Held                           2
Term of Interest Rate Derivatives                     5 years 3 years    
Derivative, Amount of Hedged Item                     $ 100,000 $ 100,000    
Debt Instrument, Description of Variable Rate Basis                     one-month LIBOR one-month LIBOR    
Number of Banks Transacted With for Interest Rate Swap Agreements                     3      
Derivative, Fixed Interest Rate                         1.03% 2.947%
Maximum Remaining Maturity of Foreign Currency Derivatives 2 years                          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     (87) (635) 898 (1,128) (985) 493            
Derivative, Net Hedge Ineffectiveness Gain (Loss) 0 0                        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net                 $ (739) $ 3,462