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Derivative financial instruments for hedging purposes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount $ 1,437,294 $ 840,796  
Derivative, Fair Value Asset 15,217 [1] 19,239 [1] 4,159
Derivative, Fair Value Liability 8,572 [1] 11,747 [1]  
Net gain on the ineffective portion of hedging activities 353 [2] 71 [2]  
Fair Value Hedging [Member] | Interest Rate Swap [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 494,558 480,000  
Derivative, Fair Value Asset 4,625 [1] 8,319 [1]  
Derivative, Fair Value Liability 1,403 [1] 6,600 [1]  
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 269,488 236,866  
Derivative, Fair Value Asset 2,783 [1] 3,525 [1]  
Derivative, Fair Value Liability 6,834 [1] 4,665 [1]  
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 453,000 0  
Derivative, Fair Value Asset 393 [1] 0 [1]  
Derivative, Fair Value Liability 243 [1] 0 [1]  
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 126,308 42,001  
Derivative, Fair Value Asset 6,392 [1] 7,333 [1]  
Derivative, Fair Value Liability 0 [1] 23 [1]  
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 88,130 75,733  
Derivative, Fair Value Asset 684 [1] 62 [1]  
Derivative, Fair Value Liability 92 [1] 411 [1]  
Net Investment Hedging [Member] | Foreign Exchange Forward [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 5,810 6,196  
Derivative, Fair Value Asset 340 [1] 0 [1]  
Derivative, Fair Value Liability $ 0 [1] $ 48 [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.