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Share-Based Transactions - Summary of Activity Related to Stock Options Outstanding and Exercisable (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares, outstanding beginning balance 107 145 203  
Number of shares, granted     90  
Number of shares, exercised (33) (38) (148)  
Number of shares, outstanding ending balance 74 107 145  
Weighted average exercise price, outstanding beginning balance $ 45.15 $ 44.75 $ 41.28  
Weighted average exercise price, granted     41.88  
Weighted average exercise price, exercised 47.59 43.63 38.24  
Weighted average exercise price, outstanding ending balance $ 44.07 $ 45.15 $ 44.75  
Number of shares, exercisable 44 32 6 35
Weighted average exercise price, exercisable $ 45.55 $ 47.26 $ 53.50 $ 36.38
$41.20 (average term remaining - 5.1 years) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares, vested option exercise prices outstanding 7      
Weighted average exercise price, vested option exercise prices outstanding $ 41.20      
Number of shares, vested option exercise prices exercisable 7      
Weighted average exercise price, vested option exercise prices exercisable $ 41.20      
$53.50 (average term remaining - 6.2 years) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares, vested option exercise prices outstanding 14      
Weighted average exercise price, vested option exercise prices outstanding $ 53.50      
Number of shares, vested option exercise prices exercisable 14      
Weighted average exercise price, vested option exercise prices exercisable $ 53.50      
$41.88 (average term remaining - 7.1 years) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares, vested option exercise prices outstanding 52      
Weighted average exercise price, vested option exercise prices outstanding $ 41.88      
Number of shares, vested option exercise prices exercisable 22      
Weighted average exercise price, vested option exercise prices exercisable $ 41.88