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Stock Compensation Plans - Restricted Share Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of shares 303,838    
Shares expected to settle in shares 296,597    
Shares expected to settle in cash 7,241    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding - beginning of year, Number of Shares 1,196,492    
Outstanding - beginning of year, Weighted-average Grant Date Fair Value $ 38.76    
Granted, Number of shares 468,932 388,525 407,436
Granted, Weighted-average Grant Date Fair Value $ 41.57    
Vested, Number of shares (539,396)    
Vested, Weighted-average Grant Date Fair Value $ 32.08    
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Option Forfeited in Period Weighted Average Grant Date Fair Value $ 43.31    
Outstanding - end of year, Number of Shares 1,106,724 1,196,492  
Outstanding - end of year, Weighted-average Grant Date Fair Value $ 43.13 $ 38.76  
Shares expected to settle in cash 161,405    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares expected to settle in shares 157,465    
Shares expected to settle in cash 3,940    
Deferred Compensation, Share-based Payments [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Deferred Compensation Arrangement with Individual, Shares Issued 14,870