Annual report pursuant to Section 13 and 15(d)

Treasury Stock - Additional Information (Details)

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Treasury Stock - Additional Information (Details) - Common Stock - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 09, 2019
Aug. 07, 2018
Aug. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Share Repurchase Program August 2017            
Equity Class Of Treasury Stock [Line Items]            
Stock approved for repurchase, value       $ 7.0    
Period of stock repurchase program       12 months    
Additional period of stock repurchase program     12 months      
Share Repurchase Program September 9, 2019            
Equity Class Of Treasury Stock [Line Items]            
Stock approved for repurchase, value   $ 7.0        
Period of stock repurchase program   12 months        
Share Repurchase Program August 2017 and September 2019            
Equity Class Of Treasury Stock [Line Items]            
Stock repurchase, shares 465,000       108,000 222,000
Stock repurchase, weighted average price per share $ 10.02       $ 11.41 $ 9.92
Stock repurchase, cost $ 4.7       $ 1.2 $ 2.2