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Accumulated other comprehensive income (loss) (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (522) [1] $ 11,202 [1] $ 1,119 [1]
Derivative Financial Instruments, Assets [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1,985) 5,427 (960)
Available-For-Sale Securities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1,487 [1] 5,775 [1] 2,079 [1]
Foreign Currency Translation Adjustment Net Of Hedges [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (24) [1] 0 [1] 0 [1]
Foreign Currency Translation Adjustment Net Of Hedges [Member] | Segment, Discontinued Operations [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (24) 0 0
Designated as Hedging Instrument [Member] | Available-For-Sale Securities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 333 0 0
Interest Income [Member] | Derivative Financial Instruments, Assets [Member] | Foreign Exchange Forward [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1,472) (564) (124)
Interest Income [Member] | Available-For-Sale Securities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2 0 0
Interest Expense [Member] | Derivative Financial Instruments, Assets [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 31 (169) 172
Gain Loss On Sale Of Available-for-sale Securities [Member] | Available-For-Sale Securities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1,152 5,775 2,079
Foreign Currency Gain (Loss) [Member] | Derivative Financial Instruments, Assets [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (544) $ 6,160 $ (1,008)
[1] Reclassification adjustments include amounts recognized in net income during the current period that had been part of other comprehensive income (loss) in this and previous periods.