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Stock-Based Compensation Arrangements (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2011
Stock-based compensation  
Number outstanding (in shares) 502,249
Number exercisable (in shares) 412,012
$2.03 - $13.86
  
Stock-based compensation  
Low end of the range (in dollars per share) $ 2.03
High end of the range (in dollars per share) $ 13.86
Number outstanding (in shares) 217,130
Weighted Average remaining contractual life 7 years 9 months 7 days
Number exercisable (in shares) 144,770
$15.05 - $34.65
  
Stock-based compensation  
Low end of the range (in dollars per share) $ 15.05
High end of the range (in dollars per share) $ 34.65
Number outstanding (in shares) 53,983
Weighted Average remaining contractual life 7 years 1 month 24 days
Number exercisable (in shares) 36,713
$36.82 - $40.67
  
Stock-based compensation  
Low end of the range (in dollars per share) $ 36.82
High end of the range (in dollars per share) $ 40.67
Number outstanding (in shares) 72,602
Weighted Average remaining contractual life 5 years 9 months 25 days
Number exercisable (in shares) 71,996
$44.10 - $48.65
  
Stock-based compensation  
Low end of the range (in dollars per share) $ 44.10
High end of the range (in dollars per share) $ 48.65
Number outstanding (in shares) 127,320
Weighted Average remaining contractual life 4 years 6 months 25 days
Number exercisable (in shares) 127,319
$54.60 - $105.00
  
Stock-based compensation  
Low end of the range (in dollars per share) $ 54.60
High end of the range (in dollars per share) $ 105.00
Number outstanding (in shares) 31,214
Weighted Average remaining contractual life 4 years 11 months 5 days
Number exercisable (in shares) 31,214