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Common Stock and Stock-based Compensation (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Summary of options outstanding  
Number of Outstanding and Exercisable options 96
Weighted average Remaining Life (Years) 1 year 4 months 24 days
Weighted average Exercise Price $ 15.98
Range of Exercise Prices One [Member]
 
Summary of options outstanding  
Range of option prices, Lower range $ 5.55
Range of option prices, Upper range $ 8.10
Number of Outstanding and Exercisable options 11
Weighted average Remaining Life (Years) 4 months 24 days
Weighted average Exercise Price $ 6.75
Range of Exercise Prices Two [Member]
 
Summary of options outstanding  
Range of option prices, Lower range $ 14.80
Range of option prices, Upper range $ 16.10
Number of Outstanding and Exercisable options 8
Weighted average Remaining Life (Years) 1 year 9 months 18 days
Weighted average Exercise Price $ 15.45
Range of Exercise Prices Three [Member]
 
Summary of options outstanding  
Range of option prices, Lower range $ 17.075
Range of option prices, Upper range $ 17.58
Number of Outstanding and Exercisable options 77
Weighted average Remaining Life (Years) 1 year 6 months
Weighted average Exercise Price $ 17.31