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Equity and Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Equity and Stock-Based Compensation [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
   December 31, 
    2012  2011  2010 
 Stock options$542 $482 $404 
 Nonvested stock awards and restricted stock units 1,504  1,430  1,096 
 Employee stock purchase plan 48  44  42 
 Non-elective and elective 401(k) matching contribution in stock 1,653  1,497  1,424 
 Director stock ownership plan 60  60  130 
 Total share-based compensation expense$3,807 $3,513 $3,096 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
  2012 2011
    Weighted   Weighted   Weighted  Weighted
    Average  Average   Average Average
    Exercise   Remaining   Exercise  Remaining
  Number of Price   Contractual Number of Price  Contractual
  Shares per Share  Term (years) Shares per Share Term (years)
Options outstanding at January 1,253,342 $16.43    303,444 $14.19  
 Options granted40,157  38.57    36,835  37.37  
 Options exercised(177,574)  11.87    (75,919)  18.02  
 Options forfeited(8,470)  29.32    (11,018)  13.67  
Options outstanding at December 31, 107,455 $31.23  5.1 253,342 $16.43 4.7
Options exercisable at December 31, 17,360 $28.81  4.4 98,239 $11.83 4.3
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
      Number Weighted Weighted Number Weighted
      Outstanding  Average Average Exercisable Average
Range ofat Contractual Exercise at Exercise
Exercise Prices12/31/2012 Life Price 12/31/2012 Price
$0.00- $10.000 0 $0 0 $0
$10.01- $20.0038,139 4.0  18.85 8,073  18.97
$20.01- $30.000 0  0 0  0
$30.01- $40.0067,124 5.7  37.77 9,287  37.37
$40.01- $50.002,192 6.5  46.21 0  0
      107,455 5.1  31.23 17,360  28.81
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   June 30,  March 31,   Year Ended December 31,  
   2012  2012  2011  2010  2009  
 Stock option awards 2,192  37,965  36,835  110,939  165,990  
 Dividend yield 2.69% 3.09% 5.00% 5.10% 3.90% 
 Expected volatility 69.09% 69.90% 62.13% 53.72% 44.22% 
 Risk-free interest rate 0.58% 0.61% 1.99% 2.85% 2.09% 
 Expected term (years) 4.0  4.0  5.0  6.0  6.0  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   Year Ended December 31,  
   2012  2011  2010  
 2012 Stock option awards$167 $0 $0  
 2011 Stock option awards$164 $139 $0  
 2010 Stock option awards$193 $224 $209  
 2009 Stock option awards$18 $113 $112  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Weighted 
    Average Grant 
  Number of Date Fair Value 
  Shares (per share) 
 Nonvested awards, December 31, 2011169,863 $20.66 
 Granted42,754 $39.43 
 Vested(83,019) $12.99 
 Forfeited(6,654) $27.67 
 Nonvested awards, December 31, 2012122,944 $31.98 

    Weighted 
    Average Grant 
  Number of Date Fair Value 
  Shares (per share) 
 Nonvested awards, December 31, 201162,250 $7.72 
 Granted0 $0.00 
 Vested(59,850) $7.72 
 Forfeited(2,400) $7.72 
 Nonvested awards, December 31, 20120 $0.00 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Weighted 
    Average Grant 
  Number of Date Fair Value 
  Units (per unit) 
 Nonvested awards, December 31, 20110 $0.00 
 Granted2,100 $38.13 
 Vested0 $0.00 
 Forfeited0 $0.00 
 Nonvested awards, December 31, 20122,100 $38.13