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Derivative financial instruments for hedging purposes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative, Notional Amount $ 840,796 $ 461,743  
Derivative financial instruments used for hedging - receivable 19,239 [1] 4,159 [1] 2,103
Derivative financial instruments used for hedging - payable 11,747 [1] 53,742 [1]  
Derivative, Net Hedge Ineffectiveness Gain (Loss) 71 [2] 2,849 [2]  
Fair Value Hedging [Member] | Interest Rate Swap [Member]
      
Derivative, Notional Amount 480,000 125,000  
Derivative financial instruments used for hedging - receivable 8,319 [1] 16 [1]  
Derivative financial instruments used for hedging - payable 6,600 [1] 10,317 [1]  
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member]
      
Derivative, Notional Amount 236,866 215,107  
Derivative financial instruments used for hedging - receivable 3,525 [1] 56  
Derivative financial instruments used for hedging - payable 4,665 [1] 40,574  
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
      
Derivative, Notional Amount 0 20,000  
Derivative financial instruments used for hedging - receivable 0 [1] 0 [1]  
Derivative financial instruments used for hedging - payable 0 [1] 512 [1]  
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member]
      
Derivative, Notional Amount 42,001 42,336  
Derivative financial instruments used for hedging - receivable 7,333 [1] 3,549 [1]  
Derivative financial instruments used for hedging - payable 23 [1] 0 [1]  
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
      
Derivative, Notional Amount 75,733 53,264  
Derivative financial instruments used for hedging - receivable 62 [1] 249 [1]  
Derivative financial instruments used for hedging - payable 411 [1] 2,339 [1]  
Net Investment Hedging [Member] | Foreign Exchange Forward [Member]
      
Derivative, Notional Amount 6,196 6,036  
Derivative financial instruments used for hedging - receivable 0 [1] 289 [1]  
Derivative financial instruments used for hedging - payable $ 48 [1] $ 0 [1]  
[1] The fair value of assets and liabilities is reported within the derivative financial instruments used for hedging - receivable and payable lines in the consolidated balance sheets, respectively.
[2] Gains and losses resulting from ineffectiveness and credit risk in hedging activities are reported within the derivative financial instruments and hedging line in the consolidated statements of income.