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Stock-Based Compensation (Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Options, Outstanding [Roll Forward]    
Outstanding, beginning of period 394,322  
Granted 0  
Exercised (4,000)  
Canceled/Forfeited (2,250)  
Expired 0  
Outstanding, end of period 388,072 394,322
Exercisable, end of period 364,990  
Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Outstanding, weighted average exercise price, beginning of period $ 15.30  
Granted, weighted average exercise price $ 0.00  
Exercised, weighted average exercise price $ 7.50  
Canceled/Forfeited, weighted average exercise price $ 16.90  
Expired, weighted average exercise price $ 0.00  
Outstanding, weighted average exercise price, end of period $ 15.37 $ 15.30
Exercisable, weighted average exercise price, end of period $ 15.33  
Options, Weighted Average Remaining Contractual Term:    
Outstanding, weighted average remaining contractual life (years), beginning of period 6 years 0 months 18 days 5 years 9 months 15 days
Outstanding, weighted average remaining contractual life (years), end of period 6 years 0 months 18 days 5 years 9 months 15 days
Exercisable, weighted average remaining contractual life (years), end of period 5 years 4 months 24 days  
Options, Intrinsic Value:    
Outstanding, aggregate intrinsic value, beginning of period $ 910  
Exercised, aggregate intrinsic value 45  
Canceled/Forfeited, aggregate intrinsic value 3  
Outstanding, aggregate intrinsic value, end of period 1,596 910
Exercisable, aggregate intrinsic value, end of period $ 1,497