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Repurchase Program (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Nov. 30, 2018
Equity, Class of Treasury Stock [Line Items]        
Shares repurchased, value $ 10,524,000 $ 15,537,000    
Share repurchase program        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program, authorized amount       $ 100,000,000
Shares repurchased (in shares)   2,047,014 0  
Shares repurchased, value   $ 15,500,000    
Stock repurchase program, remaining authorized repurchase amount $ 84,500,000 $ 84,500,000