XML 59 R100.htm IDEA: XBRL DOCUMENT v2.4.0.6
Cash and stock-based compensation plans (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2011
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2010
Directors [Member]
Restricted Stock [Member]
Outstanding Shares (beginning balance) 534 1,812 17,746 18,755 82,005 88,027 62,938
Granted Shares         32,317 25,541 38,115
Vested Shares         (23,493) (31,563) (13,026)
Outstanding Shares (ending balance) 534 1,812 17,746 18,755 90,829 82,005 88,027
Expected to vest Shares         90,829    
Outstanding Weighted average grant date fair value         $ 14.59 $ 13.07 $ 13.58
Granted - Weighted average grant date fair value         $ 22.09 $ 18.07 $ 12.46
Vested - Weighted average grant date fair value         $ 14.35 $ 13.14 $ 13.80
Outstanding Weighted average grant date fair value         $ 17.32 $ 14.59 $ 13.07
Expected to vest Weighted average grant date fair value         17.32