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Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details) - SARs - USD ($)
$ / shares in Units, shares in Thousands, $ 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, Options, Outstanding [Roll Forward]        
Number Of Shares, Outstanding Beginning Balance 25 25 22  
Number Of Shares, SARs granted 4 4 5  
Number Of Shares, SARs exercised (1) (4) (2)  
Number Of Shares, Outstanding Ending Balance 28 25 25 22
Number Of Shares, Exercisable as of December 31, 2018 27      
Number Of Shares, Unvested as of December 31, 2018 1      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Weighted Average Exercise Price, Outstanding Beginning Balance $ 93.40 $ 65.85 $ 57.04  
Weighted Average Exercise Price, SARs granted 188.71 192.71 93.87  
Weighted Average Exercise Price, SARs exercised 41.50 36.38 32.00  
Weighted Average Exercise Price, Outstanding Ending Balance 110.27 $ 93.40 $ 65.85 $ 57.04
Weighted Average Exercise Price, Exercisable as of December 31, 2018 107.05      
Weighted Average Exercise Price, Unvested as of December 31, 2018 $ 188.71      
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 7 months 20 days 3 years 11 months 23 days 3 years 10 months 6 days 3 years 11 months 4 days
Average Remaining Contractual Term, Exercisable as of December 31, 2018 3 years 6 months 10 days      
Average Remaining Contractual Term, Unvested as of December 31, 2018 6 years 4 months 17 days      
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 2,624 $ 837 $ 945  
Aggregate Intrinsic Value, Outstanding Ending Balance 2,019 $ 2,624 $ 837 $ 945
Aggregate Intrinsic Value, Exercisable as of December 31, 2018 2,019      
Aggregate Intrinsic Value, Unvested as of December 31, 2018 $ 0