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Unrecognized tax benefits (Details 7) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 105,000 $ 7,845,000 $ 7,845,000
Settlements 0 (7,740,000) 0
Lapse of statute of limitations (105,000) 0 0
Balance at end of year 0 105,000 7,845,000
Unrecognized tax benefits highly certain deductibility 0 0  
Unrecognized tax benefits that would affect the effective tax rate   119,000  
Unrecognized tax benefits, interest and penalties   14,000  
Interest expense recognized in income tax expense 122,000 387,000 107,000
Interest expense 3,400,000 1,200,000 914,000
Interest income 3,700,000 469,000 $ 655,000
Accrued liability for payment of interest $ 94,000    
Amount of interest income accrued for an over payment of income taxes   $ 367,000