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Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Summary of Option Activity (Details)
 9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 1,114,169
Granted (in shares) | shares 260,000
Exercised (in shares) | shares (47,055)
Expired/Forfeited (in shares) | shares (7,500)
Outstanding at end of period (in shares) | shares 1,319,614
Exercisable at end of period (in shares) | shares 773,614
Weighted Average Exercise Price per share  
Outstanding at beginning of period (in usd per share) | $ / shares $ 52.40
Granted (in usd per share) | $ / shares 55.71
Exercised (in usd per share) | $ / shares 45.11
Expired/Forfeited (in usd per share) | $ / shares 56.07
Outstanding at end of period (in usd per share) | $ / shares 53.29
Exercisable at end of period (in usd per share) | $ / shares $ 52.29
Aggregate Intrinsic Value  
Outstanding at beginning of period | $ $ 543,662
Granted | $ 0
Exercised | $ 512,322
Expired/Forfeited | $ 0
Outstanding at end of period | $ 3,712,807
Exercisable at end of period | $ $ 2,889,025