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Share and Unit-Based Plans - SARs (Details)
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
SARs  
Units  
Balance at beginning of period (shares) | shares 417,783
Granted (shares) | shares 0
Exercised (shares) | shares (143,822)
Special dividend adjustment (shares) | shares 10,185
Balance at end of period (shares) | shares 284,146
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 55.13
Granted (in dollars per share) | $ / shares 0.00
Vested (in dollars per share) | $ / shares 53.73
Special dividend adjustment (in dollars per share) | $ / shares 53.88
Balance at end of period (in dollars per share) | $ / shares $ 53.85
Stock Options  
Units  
Balance at beginning of period (shares) | shares 10,314
Granted (shares) | shares 0
Exercised (shares) | shares 0
Special dividend adjustment (shares) | shares 251
Balance at end of period (shares) | shares 10,565
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 58.15
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 0.00
Special dividend adjustment (in dollars per share) | $ / shares 56.77
Balance at end of period (in dollars per share) | $ / shares $ 56.77