Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details 1)

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Benefit Plans (Details 1) (Employee Stock Option [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Stock Option [Member]
      
Stock options activity under share based payment plans, options      
Outstanding, options, beginning balance (in shares) 439,580 401,870 364,792
Granted, options (in shares) 58,626 77,450 71,179
Exercised, options (in shares) (214,199) (13,300) (19,360)
Forfeited, cancelled or expired, options (in shares) (9,495) (26,440) (14,741)
Outstanding, options, ending balance (in shares) 274,512 439,580 401,870
Exercisable, options (in shares) 93,822    
Stock options activity under share based payment plans, weighted-average remaining contractual term      
Outstanding, weighted-average exercise price, beginning balance (in dollars per share) $ 1.25 [1] $ 1.32 [1] $ 1.44 [1]
Granted, weighted-average exercise price (in dollars per share) $ 2.53 [1] $ 1.80 [1] $ 0.97 [1]
Exercised, weighted-average exercise price (in dollars per share) $ 0.59 [1] $ 0.87 [1] $ 0.56 [1]
Forfeited, cancelled or expired, weighted-average exercise price (in dollars per share) $ 3.09 [1] $ 4.15 [1] $ 3.58 [1]
Outstanding, weighted-average exercise price, ending balance (in dollars per share) $ 1.92 [1] $ 1.25 [1] $ 1.32 [1]
Exercisable, weighted-average exercise price $ 2.53 [1]    
Outstanding, weighted average remaining contractual term 7 years 3 months 15 days    
Exercisable, weighted average remaining contractual term 5 years 2 months 9 days    
Outstanding, aggregate intrinsic value $ 320,751    
Exercisable, aggregate intrinsic value $ 89,517    
[1] The weighted-average exercise price for options outstanding and exercisable as of December 31, 2012 in the table above have been adjusted to reflect the reduction to the exercise price related to the December 28, 2012 special cash dividend.