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Cash and stock-based compensation plans (Details 8)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Shares (beginning balance) 534 1,812 17,746
Exercised (534) (1,278) (15,934)
Outstanding Shares (ending balance) 0 534 1,812