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Accumulated other comprehensive income (loss) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance $ 3,112 $ (6,441) $ (6,160)
Net unrealized gains (losses) arising from the year 14,135 5,192 3,716
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (11,202) [1] (1,119) [1] (3,997) [1]
Foreign currency translation adjustment, net (551) (744)  
Balance 730 3,112 (6,441)
Available-For-Sale Securities [Member]
      
Balance (1,728) (3,744) (3,244)
Net unrealized gains (losses) arising from the year 8,436 4,095 2,325
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (5,775) [1] (2,079) [1] (2,825) [1]
Foreign currency translation adjustment, net 0 0  
Balance 933 (1,728) (3,744)
Foreign Currency Translation Adjustment Net Of Hedges [Member]
      
Balance (744) 0 0
Net unrealized gains (losses) arising from the year 0 0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0 [1] 0 [1] 0 [1]
Foreign currency translation adjustment, net (551) (744)  
Balance (1,295) (744) 0
Derivative Financial Instruments, Assets [Member]
      
Balance (640) (2,697) (2,916)
Net unrealized gains (losses) arising from the year 5,699 1,097 1,391
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (5,427) [1] 960 [1] (1,172) [1]
Foreign currency translation adjustment, net 0 0  
Balance $ (368) $ (640) $ (2,697)
[1] Reclassification adjustments include amounts recognized in net income during the current year that had been part of other comprehensive income (loss) in this and previous years