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Share and Unit-Based Plans - SARs (Details)
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
SARs  
Units  
Balance at beginning of period (in shares) | shares 235,439
Granted (in shares) | shares 0
Exercised (in shares) | shares (225,439)
Balance at end of period (in shares) | shares 10,000
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 53.83
Granted (in dollars per share) | $ / shares 0.00
Vested (in dollars per share) | $ / shares 53.95
Balance at end of period (in dollars per share) | $ / shares $ 51.70
Stock Options  
Units  
Balance at beginning of period (in shares) | shares 35,565
Granted (in shares) | shares 0
Exercised (in shares) | shares 0
Balance at end of period (in shares) | shares 35,565
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 57.32
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 0.00
Balance at end of period (in dollars per share) | $ / shares $ 57.32