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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic        
Net income $ 21,639 $ 21,079 $ 48,531 $ 48,876
Less: Distributed earnings to common shareholders 8,189 8,326 24,558 24,497
Less: Distributed earnings to participating securities 48 47 141 134
Undistributed earnings 13,402 12,706 23,832 24,245
Undistributed earnings allocated to common shareholders 13,323 12,633 23,696 24,114
Undistributed earnings allocated to participating securities 79 73 136 131
Total income available to common shareholders, basic $ 21,512 $ 20,959 $ 48,254 $ 48,611
Weighted average Common Shares outstanding, basic (in shares) 36,561 37,063 36,546 37,653
Basic earnings per Common Share (in dollars per share) $ 0.59 $ 0.57 $ 1.32 $ 1.29
Diluted        
Total income available to common shareholders, basic $ 21,512 $ 20,959 $ 48,254 $ 48,611
Undistributed earnings for dilutive stock-based awards 79 73 136 131
Total common shareholders earnings, diluted $ 21,591 $ 21,032 $ 48,390 $ 48,742
Weighted average Common Shares outstanding, basic (in shares) 36,561 37,063 36,546 37,653
Stock-based compensation (in shares) [1] 201 203 197 200
Weighted average common shares outstanding, diluted (in shares) 36,762 37,266 36,743 37,853
Diluted earnings per Common Share (in dollars per share) $ 0.59 $ 0.56 $ 1.32 $ 1.29
[1] n applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 138,060 and 174,306 stock options at September 30, 2016 and 2015, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 216,733 and 211,406 restricted stock units at September 30, 2016 and 2015, respectively, were included in the calculation of diluted EPS for the nine months ended September 30, 2016 and 2015.