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Share-based Compensation (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
2005 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Available For Grant, Beginning of Period 613,434 603,634
Shares Available For Grant, Awards Granted (428,746) (3,000)
Shares Available For Grant, Forfeitures 0 4,800
Shares Available For Grant, End of Period 184,688 605,434
2005 Plan | Restricted Stock
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of Shares, Beginning of Period 46,000 63,000
Number of Shares, Awards Granted 428,746 0
Number of Shares, Vested 0 (6,000)
Number of Shares, Forfeitures 0 (3,000)
Number of Shares, End of Period 474,746 54,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted Average Grant Date Fair Value, Beginning of Period 17.032 16.995
Weighted Average Grant Date Fair Value, Awards Granted 4.510 0.000
Weighted Average Grant Date Fair Value, Vested 0.000 16.855
Weighted Average Grant Date Fair Value, Forfeitures 0.000 17.075
Weighted Average Grant Date Fair Value, End of Period 5.723 17.006
2005 Plan | Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Number of Shares, Beginning of Period 17,800 16,600
Number of Shares, Awards Granted 0 3,000
Number of Shares, Forfeitures 0 (1,800)
Number of Shares, Expired 0 0
Number of Shares, End of Period 17,800 17,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Weighted Average Exercise Price, Beginning of Period 10.526 12.043
Weighted Average Exercise Price, Awards Granted 0.000 4.120
Weighted Average Exercise Price, Forfeitures 0.000 13.840
Weighted Average Exercise Price, Expired 0.000 0.000
Weighted Average Exercise Price, End of Period 10.526 10.526
Number of Shares, Exercisable 12,400  
Weighted Average Exercise Price, Shares Exercisable 12.672  
1999 Plan | Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Number of Shares, Beginning of Period 15,800 15,800
Number of Shares, Awards Granted 0 0
Number of Shares, Forfeitures (600) 0
Number of Shares, Expired (5,000) 0
Number of Shares, End of Period 10,200 15,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Weighted Average Exercise Price, Beginning of Period 16.018 16.018
Weighted Average Exercise Price, Awards Granted 0.000 0.000
Weighted Average Exercise Price, Forfeitures 5.140 0.000
Weighted Average Exercise Price, Expired 12.625 0.000
Weighted Average Exercise Price, End of Period 18.322 16.018
Number of Shares, Exercisable 10,200  
Weighted Average Exercise Price, Shares Exercisable 18.322