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Stock-Based Compensation Plans (Details)
 9 Months Ended
Sep. 30, 2019
$ / shares
shares
Shares  
Exercised (in shares) (81,626)
2009 Plan | Employee and Directors Stock Options  
Shares  
Options outstanding at the beginning of the period (in shares) 124,212
Exercised (in shares) (81,626)
Granted (in shares) 0
Forfeited (in shares) 0
Options outstanding at the end of the period (in shares) 42,586
Options exercisable (in shares) 42,586
Weighted average exercise price per share  
Options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 128.84
Exercised (in dollars per share) | $ / shares 130.33
Granted (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 0
Options outstanding at the end of the period (in dollars per share) | $ / shares 125.98
Options exercisable (in dollars per share) | $ / shares $ 125.98