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Share-Based Compensation - Restricted Stock Awards and Performance Share Awards Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock      
Restricted Stock Awards and Performance Share Awards      
Outstanding at beginning of year (in shares) 628,642 622,814 566,447
Granted (in shares) 206,922 199,629 389,193
Released (in shares) (154,878) (165,846) (275,229)
Forfeited (in shares) (22,962) (27,955) (57,597)
Outstanding at end of year (in shares) 657,724 628,642 622,814
Weighted-Average Grant Date Fair Value      
Outstanding at beginning of year (in USD per share) $ 77.70 $ 70.19 $ 77.68
Granted (in USD per share) 150.60 98.90 51.93
Released (in USD per share 107.22 75.90 59.39
Forfeited (in USD per share) 88.77 72.81 70.50
Outstanding at end of year (in USD per share) $ 93.45 $ 77.70 $ 70.19
Performance Share Awards      
Restricted Stock Awards and Performance Share Awards      
Outstanding at beginning of year (in shares) 265,747 379,226 332,630
Granted (in shares) 59,849 79,423 172,024
Released (in shares) (57,074) (2,029) (111,325)
Forfeited (in shares) (8,795) (190,873) (14,103)
Outstanding at end of year (in shares) 259,727 265,747 379,226
Weighted-Average Grant Date Fair Value      
Outstanding at beginning of year (in USD per share) $ 77.04 $ 70.14 $ 73.40
Granted (in USD per share) 146.83 98.97 51.01
Released (in USD per share 107.31 62.70 46.58
Forfeited (in USD per share) 81.07 73.09 75.73
Outstanding at end of year (in USD per share) $ 86.41 $ 77.04 $ 70.14
Maximum | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Maximum | Performance Share Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Non-employee Directors | Restricted Stock      
Restricted Stock Awards and Performance Share Awards      
Granted (in shares) 7,980 12,488 25,088