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v2.4.1.9

Significant accounting policies - Embedded derivatives (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other expenses | $ 2,982 us-gaap_OtherExpenses | $ 1,246 us-gaap_OtherExpenses | $ 4,789 us-gaap_OtherExpenses | $ 2,675 us-gaap_OtherExpenses
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other expenses | $ 1,200 us-gaap_OtherExpenses / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |  | $ 2,700 us-gaap_OtherExpenses / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |

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