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Earnings per Share/Capital Stock: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Dividends Declared Per Common Share (in dollars per share) $ 0.365 $ 0.335
Payment, Tax Withholding, Share-based Payment Arrangement $ 1,188 $ 1,269
Dividends paid 13,485 12,361
Basic    
Net income 14,162 19,268
Weighted Average Dividends Common Stock 13,485 12,361
Less: Distributed earnings to participating securities 31 37
Undistributed earnings 646 6,870
Undistributed earnings allocated to common shareholders 644 6,850
Undistributed earnings allocated to participating securities 2 20
Total income available to common shareholders, basic $ 14,129 $ 19,211
Weighted average Common Shares outstanding, basic (in shares) 36,944 36,898
Basic earnings per Common Share (in dollars per share) $ 0.38 $ 0.52
Diluted    
Total income available to common shareholders, basic $ 14,129 $ 19,211
Undistributed earnings for dilutive stock-based awards 2 20
Total common shareholders earnings, diluted $ 14,131 $ 19,231
Weighted average Common Shares outstanding, basic (in shares) 36,944 36,898
Stock-based compensation (in shares) 75 95
Weighted Average Number of Diluted Shares (in shares) 37,019 36,993
Diluted earnings per Common Share (in dollars per share) $ 0.38 $ 0.52