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Earnings per Share/Capital Stock: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]            
Payment, Tax Withholding, Share-based Payment Arrangement         $ 1,271 $ 1,809
Dividends paid         24,727 22,492
Basic            
Net income $ 26,576 $ 19,268 $ 25,612 $ 14,072 $ 45,844 $ 39,684
Dividends Declared Per Common Share (in dollars per share) $ 0.335   $ 0.305   $ 0.670 $ 0.610
Weighted Average Dividends Common Stock $ 12,366   $ 11,250   $ 24,727 $ 22,492
Less: Distributed earnings to participating securities 35   40   65 77
Undistributed earnings 14,175   14,322   21,052 17,115
Undistributed earnings allocated to common shareholders 14,135   14,271   20,997 17,057
Undistributed earnings allocated to participating securities 40   51   55 58
Total income available to common shareholders, basic $ 26,501   $ 25,521   $ 45,724 $ 39,549
Weighted average Common Shares outstanding, basic (in shares) 36,916   36,884   36,907 36,872
Basic earnings per Common Share (in dollars per share) $ 0.72   $ 0.69   $ 1.24 $ 1.07
Diluted            
Total income available to common shareholders, basic $ 26,501   $ 25,521   $ 45,724 $ 39,549
Undistributed earnings for dilutive stock-based awards 40   51   55 58
Total common shareholders earnings, diluted $ 26,541   $ 25,572   $ 45,779 $ 39,607
Weighted average Common Shares outstanding, basic (in shares) 36,916   36,884   36,907 36,872
Stock-based compensation (in shares) 91   116   86 113
Weighted Average Number of Diluted Shares (in shares) 37,007   37,000   36,993 36,985
Diluted earnings per Common Share (in dollars per share) $ 0.72   $ 0.69   $ 1.24 $ 1.07