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Share Repurchases (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items]        
Percentage of employee's earnings withheld 10.00%      
Number of Shares 194,124 175,469    
Average Price per Share (usd per share) $ 20.59 $ 15.81    
Repurchases of common stock $ 4,000,000 $ 3,000,000 $ 53,000,000  
Share Repurchase Program 2014        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program, authorized amount       $ 350,000,000
Stock repurchase program, remaining authorized repurchase amount $ 160,000,000      
Number of Shares 0 0    
Average Price per Share (usd per share) $ 0 $ 0    
Repurchases of common stock $ 0 $ 0    
Share Maintenance Plan        
Equity, Class of Treasury Stock [Line Items]        
Number of Shares 0 0    
Average Price per Share (usd per share) $ 0 $ 0    
Repurchases of common stock $ 0 $ 0