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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 27, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Class of Stock [Line Items]                
Preferred Stock, Shares Authorized     50,000          
Preferred Stock, Shares Issued     0          
Cash dividends declared per common share   $ 0.34 $ 0.34 $ 0.34 $ 0.30   $ 0.64  
Stock Repurchase Program, Authorized Amount $ 40,000             $ 20,000
Purchase of treasury stock under share repurchase program     $ 10,226   $ 0      
Treasury Stock                
Class of Stock [Line Items]                
Stock Repurchased During Period, Shares 6,300,000   436,137          
Purchase of treasury stock under share repurchase program     $ 10,200          
Treasury Stock | Share Repurchase Program Authorized in November 2015 [Member]                
Class of Stock [Line Items]                
Purchase of treasury stock under share repurchase program     500          
Treasury Stock | Share Repurchase Program Authorized in February 2020 [Member]                
Class of Stock [Line Items]                
Purchase of treasury stock under share repurchase program     $ 9,700          
Subsequent Event [Member]                
Class of Stock [Line Items]                
Cash dividends declared per common share           $ 0.68