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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic        
Net income $ 21,006 $ 21,639 $ 56,499 $ 48,531
Weighted Average Dividends Common Stock 9,349 8,189 27,064 24,558
Less: Distributed earnings to participating securities 50 48 139 141
Undistributed earnings 11,607 13,402 29,296 23,832
Undistributed earnings allocated to common shareholders 11,546 13,323 29,147 23,696
Undistributed earnings allocated to participating securities 61 79 149 136
Total income available to common shareholders, basic $ 20,895 $ 21,512 $ 56,211 $ 48,254
Weighted average Common Shares outstanding, basic (in shares) 36,659 36,561 36,625 36,546
Basic earnings per Common Share (in dollars per share) $ 0.57 $ 0.59 $ 1.53 $ 1.32
Diluted        
Total income available to common shareholders, basic $ 20,895 $ 21,512 $ 56,211 $ 48,254
Undistributed earnings for dilutive stock-based awards 61 79 149 136
Total common shareholders earnings, diluted $ 20,956 $ 21,591 $ 56,360 $ 48,390
Weighted average Common Shares outstanding, basic (in shares) 36,659 36,561 36,625 36,546
Stock-based compensation (in shares) [1] 197 201 188 197
Weighted average common shares outstanding, diluted (in shares) 36,856 36,762 36,813 36,743
Diluted earnings per Common Share (in dollars per share) $ 0.57 $ 0.59 $ 1.53 $ 1.32
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 70,702 and 138,060 stock options at September 30, 2017 and 2016, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 195,457 and 216,733 restricted stock units at September 30, 2017 and 2016, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2017 and 2016.