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Accumulated other comprehensive income (loss) (Details) (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]      
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.