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Capital Stock (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 27, 2020
Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]          
Stock repurchase program, remaining authorized repurchase amount   $ 51,900,000      
Shares repurchased (in shares)   0 2,047,014    
Value of shares repurchased $ 10,524,000   $ 15,537,000    
Number of shares called by each right       1  
Series D Junior Participating Preferred Stock          
Equity, Class of Treasury Stock [Line Items]          
Temporary equity, par value (in dollars per share)       $ 0.01  
Purchase price (in dollars per share)       $ 12.00  
Percentage threshold where the Rights become exercisable for two times the purchase price       10.00%  
Convertible Notes          
Equity, Class of Treasury Stock [Line Items]          
Face amount repurchased   $ 33,100,000     $ 0
Cost of repurchase   $ 29,100,000