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Stock-Based Compensation (Details 2) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2005
Restricted stock awards      
Stock-based compensation      
Vesting period of shares awarded under the Program 3 years    
Restricted Stock Units      
Performance share awards      
Grant date fair value (in dollars per share)     $ 90.54
Performance share awards      
Stock-based compensation      
Vesting period of shares awarded under the Program 3 years    
Deferred Compensation Equity      
Performance share awards      
Number of common stock deferred (in shares) 237,261 228,047