Annual report pursuant to Section 13 and 15(d)

Stock Repurchases (Details)

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Stock Repurchases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]    
Purchase of treasury shares $ 525 $ 12,300
Securities repurchased plan, remaining authorized repurchase amount $ 129,900  
Share Incentive Plans    
Equity, Class of Treasury Stock [Line Items]    
Treasury stock, shares acquired (in shares) 8,338 212,659
Purchase of treasury shares $ 400 $ 12,300
Share Repurchase Program    
Equity, Class of Treasury Stock [Line Items]    
Treasury stock, shares acquired (in shares) 3,912  
Purchase of treasury shares $ 100