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Stock Options and Restricted Stock (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Apr. 30, 2011
1996 Equity Compensation Plan [Member]
Apr. 30, 2011
2011 Equity Compensation Plan [Member]
Apr. 30, 2012
Restricted Stock [Member]
Feb. 29, 2012
Restricted Stock [Member]
Feb. 29, 2012
Minimum [Member]
Restricted Stock [Member]
Feb. 29, 2012
Maximum [Member]
Restricted Stock [Member]
Stock Options and Restricted Stock (Textual)              
Shares approved for grants       10,728 72,013    
Shares available for grant   350,000 300,000        
Vesting period, years       3 years   5 years 7 years
Closing price of stock on date of stock grant       $ 83.88 $ 115.55    
Maximum term of the awards granted under the Plan 10 years            
Stock-based compensation cost which has not yet been recognized $ 35.8            
Stock-based compensation cost recognized period, in months 62 months            
Restricted stock awarded subject to performance condition 230,000            
Number of shares not meeting performance criteria 45,920            
Reduction in stock based compensation $ 7.0