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Stock Options, Restricted Stock and Restricted Stock Units (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Apr. 30, 2011
1996 Equity Compensation Plan [Member]
Apr. 30, 2011
2011 Equity Compensation Plan [Member]
May 31, 2013
Restricted Stock [Member]
Mar. 31, 2013
Restricted Stock [Member]
Feb. 28, 2013
Restricted Stock [Member]
May 31, 2013
Restricted Stock [Member]
Non-employee [Member]
Feb. 28, 2013
Minimum [Member]
Restricted Stock [Member]
Feb. 28, 2013
Maximum [Member]
Restricted Stock [Member]
Stock Options and Restricted Stock (Textual)                  
Shares approved for grants       43,659   165,712 16,370    
Shares available for grant   350,000 300,000            
Vesting period, years       4 years     3 years 3 years 5 years
Closing price of stock on date of stock grant           $ 62.28 $ 45.81    
Restricted shares converted to restricted stock units         200,000        
Maximum term of the awards granted under the Plan 10 years                
Stock-based compensation cost which has not yet been recognized $ 34.5                
Stock-based compensation cost recognized period, in months 54 months                
Restricted stock awarded subject to performance condition 351,000                
Number of shares not meeting performance criteria 45,920                
Reduction in stock based compensation $ 7.0