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Equity Compensation Plans and Share-Based Compensation - Restricted Stock Unit Award Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Underlying Shares - Outstanding at beginning of year 254 157 30
Underlying Shares - Outstanding at end of year 357 254 157
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-Average Exercise Price - Outstanding at beginning of year $ 59.53 $ 47.36 $ 45.93
Weighted-Average Exercise Price - Outstanding at end of year $ 69.13 $ 59.53 $ 47.36
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Underlying Shares - Granted 109 102 117
Underlying Shares - Exercised (10) (10) (10)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-Average Exercise Price - Granted $ 86.86 $ 72.70 $ 48.25
Weighted-Average Exercise Price - Vested $ 45.93 $ 45.93 $ 45.93
Vesting period 3 years    
Time Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Underlying Shares - Granted 19 17 20
Underlying Shares - Exercised (15) (12) 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-Average Exercise Price - Granted $ 86.86 $ 72.70 $ 43.55
Weighted-Average Exercise Price - Vested $ 73.78 $ 43.55 $ 0
Vesting period 5 years 5 years 5 years