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Stock Options, Restricted Stock and Restricted Stock Units (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Feb. 28, 2014
Board of Directors [Member]
May 31, 2014
Board of Directors [Member]
Vesting over four years [Member]
May 31, 2014
Board of Directors [Member]
Vesting over three years [Member]
Apr. 30, 2011
1996 Equity Compensation Plan [Member]
Apr. 30, 2011
2011 Equity Compensation Plan [Member]
Sep. 30, 2014
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant           350,000 300,000  
Shares approved for grants     46,064 46,674 15,868      
Vesting period, years       4 years 3 years      
Vesting percentage     100.00%          
Vesting date     Feb. 28, 2018          
Closing price of stock on date of stock grant     $ 33.65   $ 42.85      
Maximum term of the awards granted under the Plan 10 years              
Stock-based compensation cost which has not yet been recognized $ 31.1              
Stock-based compensation cost recognized period, in months 45 months              
Tax shortfall related to share-based payment arrangements $ 1.8 $ 3.5            
Restricted stock awarded subject to performance condition 398,000              
Number of stock options, exercised