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Earnings per Share/Capital Stock: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Exercise of stock options and other issuances of Common Shares $ 0 $ 0 $ 0 $ 0   $ 30   $ 30
Dividends Declared Per Common Share (in dollars per share) $ 0.365     $ 0.335     $ 1.035 $ 0.945
Payment, Tax Withholding, Share-based Payment Arrangement             $ 1,287 $ 1,857
Dividends paid             38,207 34,848
Basic                
Net income $ 28,153 $ 26,576 $ 19,268 $ 26,530 $ 25,612 $ 14,072 73,997 66,214
Weighted Average Dividends Common Stock 13,480     12,356     38,207 34,848
Less: Distributed earnings to participating securities 37     43     100 116
Undistributed earnings 14,636     14,131     35,690 31,250
Undistributed earnings allocated to common shareholders 14,596     14,083     35,597 31,146
Undistributed earnings allocated to participating securities 40     48     93 104
Total income available to common shareholders, basic $ 28,076     $ 26,439     $ 73,804 $ 65,994
Weighted average Common Shares outstanding, basic (in shares) 36,933     36,886     36,916 36,877
Basic earnings per Common Share (in dollars per share) $ 0.76     $ 0.72     $ 2.00 $ 1.79
Diluted                
Total income available to common shareholders, basic $ 28,076     $ 26,439     $ 73,804 $ 65,994
Undistributed earnings for dilutive stock-based awards 40     48     93 104
Total common shareholders earnings, diluted $ 28,116     $ 26,487     $ 73,897 $ 66,098
Weighted average Common Shares outstanding, basic (in shares) 36,933     36,886     36,916 36,877
Stock-based compensation (in shares) 92     116     88 113
Weighted Average Number of Diluted Shares (in shares) 37,025     37,002     37,004 36,990
Diluted earnings per Common Share (in dollars per share) $ 0.76     $ 0.72     $ 2.00 $ 1.79