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Cash and stock-based compensation plans (Details 1) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2012
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2011
Directors [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Outstanding Shares (beginning balance) 0 534 1,812 17,746 90,829 82,005 88,027
Granted Shares         28,500 32,317 25,541
Vested Shares         (34,467) (23,493) (31,563)
Outstanding Shares (ending balance) 0 534 1,812 17,746 84,862 90,829 82,005
Expected to vest Shares         84,862    
Outstanding Weighted average grant date fair value         $ 17.32 $ 14.59 $ 13.07
Granted - Weighted average grant date fair value         $ 25.00 $ 22.09 $ 18.07
Vested - Weighted average grant date fair value         $ 16.84 $ 14.35 $ 13.14
Outstanding Weighted average grant date fair value         $ 20.10 $ 17.32 $ 14.59
Expected to vest Weighted average grant date fair value         $ 20.10