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Derivative Instruments and Hedging Activities (Textuals) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2006
Derivative Instruments and Hedging Activities (Textuals)      
Fair value of investment hedge contracts $ 0 $ 1,768  
Gain on investment hedge derivative 3,021 1,768  
Maximum remaining maturity of foreign currency derivatives 24 months    
Fair value of non-designated foreign exchange forward contracts 47 (1,558)  
Fair value of interest rate contracts (3,558) (3,796)  
Notional amount related to senior notes issuance     200,000
Anticipated reclassification from other comprehensive income to interest expense within the next 12 months 933    
Interest rate swap [Member]
     
Derivative Instruments and Hedging Activities (Textuals)      
Notional amount of pay-fixed receive-variable interest rate swaps $ 50,000