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Stock-Based Compensation - Summary of Non-Qualified and Incentive Stock Option Right Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Optioned Shares      
Outstanding beginning of year (in shares) 4,646,313 5,163,709 5,219,506
Granted (in shares) 565,336 689,506 712,967
Exercised (in shares) (662,218) (1,154,698) (733,876)
Forfeited (in shares) (60,288) (49,977) (26,653)
Expired (in shares) (3,894) (2,227) (8,235)
Outstanding end of year (in shares) 4,485,249 4,646,313 5,163,709
Exercisable at end of year (in shares) 3,274,780 3,288,237 3,783,755
Weighted- Average Exercise Price Per Share      
Outstanding beginning of year (in dollars per share) $ 204.33 $ 163.61 $ 141.58
Granted (in dollars per share) 410.00 377.84 271.46
Exercised (in dollars per share) 137.03 123.16 108.81
Forfeited (in dollars per share) 327.08 267.02 232.83
Expired (in dollars per share) 238.26 236.97 176.28
Outstanding end of year (in dollars per share) 238.53 204.33 163.61
Exercisable at end of year (in dollars per share) $ 188.48 $ 156.43 $ 130.59
Aggregate Intrinsic Value      
Outstanding end of year $ 704,160 $ 955,810 $ 545,531
Exercisable at end of year $ 671,269 $ 833,938 $ 522,921