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Equity Plans Restricted Stock and Deferred Restricted Stock Activity (Details) (Restricted Stock and Deferred Restricted Stock [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Restricted Stock and Deferred Restricted Stock [Member]
 
Restricted and Deferred Restricted Stock Awards Outstanding [Roll Forward]  
Outstanding as of January 1, 2012, units 247,917
Issued, units 21,991
Exercised, units (28,888)
Forfeited or expired (11,998)
Outstanding as of December 31, 2012, units 229,022
Shares vested as of December 31, 2012, shares 152,814
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]  
Outstanding as of January 1, 2012, wtd avg grant date fair value $ 16.04
Issued, wtd avg grant date fair value $ 21.74
Exercised, wtd avg grant date fair value $ 20.90
Forfeited or expired, wtd avg grant date fair value $ 17.32
Outstanding as od December 31, 2012, wtd avg grant date fair value $ 16.65
Shares vested as of December 31, 2012, wtd avg grant date fair value $ 17.12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested as of January 1, 2012, units 85,268
Granted, units 21,991
Vested, units (19,048)
Forfeited, units (11,998)
Nonvested as of December 31, 2012, units 76,213
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Nonvested as of January 1, 2012, wtd avg grant date fair value $ 15.95
Granted, wtd avg grant date fair value $ 21.74
Vested, wtd avg grant date fair value $ 23.76
Forfeited, wtd avg grant date fair value $ 17.32
Nonvested as of December 31, 2012, wtd avg grant date fair value $ 15.45
Unrecognized compensation cost $ 622
Period for recognition of compensation cost 1 year 4 months 21 days