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Stock-Based Compensation Arrangements (Details 4) (USD $)
12 Months Ended
Dec. 31, 2012
Stock-based compensation  
Number outstanding (in shares) 463,023
Number exercisable (in shares) 393,242
$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) 196,078
Weighted Average remaining contractual life 7 years 2 months 26 days
Number exercisable (in shares) 133,108
$15.05 - $34.62
 
Stock-based compensation  
Low end of the range (in dollars per share) $ 15.05
High end of the range (in dollars per share) $ 34.62
Number outstanding (in shares) 44,618
Weighted Average remaining contractual life 6 years 1 month 10 days
Number exercisable (in shares) 37,807
$36.63 - $40.67
 
Stock-based compensation  
Low end of the range (in dollars per share) $ 36.63
High end of the range (in dollars per share) $ 40.67
Number outstanding (in shares) 72,581
Weighted Average remaining contractual life 4 years 9 months 22 days
Number exercisable (in shares) 72,581
$43.75 - $48.65
 
Stock-based compensation  
Low end of the range (in dollars per share) $ 43.75
High end of the range (in dollars per share) $ 48.65
Number outstanding (in shares) 123,353
Weighted Average remaining contractual life 3 years 6 months 22 days
Number exercisable (in shares) 123,353
$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) 26,393
Weighted Average remaining contractual life 3 years 10 months 17 days
Number exercisable (in shares) 26,393