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Derivative financial instruments for hedging purposes (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedging [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in OCI (effective portion) $ 1,036 $ 5,699 $ 1,097
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) 121 5,427 (960)
Gain (loss) recognized on derivatives (ineffective portion) 0 0 0
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in OCI (effective portion) 226 217 987
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in OCI (effective portion) (734) 3,740 2,270
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Foreign Currency Gain (Loss) [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) 0 2,481 1,958
Gain (loss) recognized on derivatives (ineffective portion) 0 0 0
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Income [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) (11)    
Gain (loss) recognized on derivatives (ineffective portion) 0    
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in OCI (effective portion) 1,544 1,742 (2,160)
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Foreign Currency Gain (Loss) [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) 1,562 3,679 (2,966)
Gain (loss) recognized on derivatives (ineffective portion) 0 0 0
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Interest Income [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) (1,461) (564) (124)
Gain (loss) recognized on derivatives (ineffective portion) 0 0 0
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Interest Expense [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) 31 (169) 172
Gain (loss) recognized on derivatives (ineffective portion) 0 0  
Net Investment Hedging [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in OCI (effective portion) 464 109 289
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) 0 0 0
Gain (loss) recognized on derivatives (ineffective portion) 0 0 0
Net Investment Hedging [Member] | Foreign Exchange Forward [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in OCI (effective portion) 464 109 289
Net Investment Hedging [Member] | Foreign Exchange Forward [Member] | Foreign Currency Gain (Loss) [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) reclassified from accumulated OCI to the statements of income (effective portion) 0 0 0
Gain (loss) recognized on derivatives (ineffective portion) $ 0 $ 0 $ 0