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Accumulated other comprehensive income (loss) (Details) (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] |  |  |  |  |  |
Balance | $ (730) |  | $ (3,112) |  | $ (6,441) |
Net unrealized gains arising from the year | (11,942) |  | 14,135 |  | 5,192 |
Reclassification adjustment for (gains) loss included in net income | 522 | [1] | (11,202) | [1] | (1,119) | [1]
Foreign currency translation adjustment, net | (425) |  | (551) |  | (744) |
Other comprehensive income (loss) from the year | (11,845) |  | 2,382 |  | 3,329 |
Balance | (12,575) |  | (730) |  | (3,112) |
Available-For-Sale Securities [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | 933 |  | (1,728) |  | (3,744) |
Net unrealized gains arising from the year | (9,640) |  | 8,436 |  | 4,095 |
Reclassification adjustment for (gains) loss included in net income | (1,487) | [1] | (5,775) | [1] | (2,079) | [1]
Foreign currency translation adjustment, net | 0 |  | 0 |  | 0 |
Other comprehensive income (loss) from the year | (11,127) |  | 2,661 |  | 2,016 |
Balance | (10,194) |  | 933 |  | (1,728) |
Derivative Financial Instruments, Assets [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (368) |  | (640) |  | (2,697) |
Net unrealized gains arising from the year | (2,302) |  | 5,699 |  | 1,097 |
Reclassification adjustment for (gains) loss included in net income | 1,985 | [1] | (5,427) | [1] | 960 | [1]
Foreign currency translation adjustment, net | 0 |  | 0 |  | 0 |
Other comprehensive income (loss) from the year | (317) |  | 272 |  | 2,057 |
Balance | (685) |  | (368) |  | (640) |
Foreign Currency Translation Adjustment Net Of Hedges [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (1,295) |  | (744) |  | 0 |
Net unrealized gains arising from the year | 0 |  | 0 |  | 0 |
Reclassification adjustment for (gains) loss included in net income | 24 | [1] | 0 | [1] | 0 | [1]
Foreign currency translation adjustment, net | (425) |  | (551) |  | (744) |
Other comprehensive income (loss) from the year | (401) |  | (551) |  | (744) |
Balance | $ (1,696) |  | $ (1,295) |  | $ (744) |
[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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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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