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Earnings per Share/Capital Stock: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Payment, Tax Withholding, Share-based Payment Arrangement $ 1,269 $ 1,809
Dividends paid 12,361 11,242
Basic    
Net income $ 19,268 $ 14,072
Dividends Declared Per Common Share (in dollars per share) $ 0.335 $ 0.305
Weighted Average Dividends Common Stock $ 12,361 $ 11,242
Less: Distributed earnings to participating securities 37 37
Undistributed earnings 6,870 2,793
Undistributed earnings allocated to common shareholders 6,850 2,784
Undistributed earnings allocated to participating securities 20 9
Total income available to common shareholders, basic $ 19,211 $ 14,026
Weighted average Common Shares outstanding, basic (in shares) 36,898 36,860
Basic earnings per Common Share (in dollars per share) $ 0.52 $ 0.38
Diluted    
Total income available to common shareholders, basic $ 19,211 $ 14,026
Undistributed earnings for dilutive stock-based awards 20 9
Total common shareholders earnings, diluted $ 19,231 $ 14,035
Weighted average Common Shares outstanding, basic (in shares) 36,898 36,860
Stock-based compensation (in shares) 95 109
Weighted Average Number of Diluted Shares (in shares) 36,993 36,969
Diluted earnings per Common Share (in dollars per share) $ 0.52 $ 0.38