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Accumulated other comprehensive income (loss) (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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.

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- Details
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References No definition available. + Details
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