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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Basic        
Net income $ 15,648 $ 15,354 $ 27,797 $ 26,375
Less: Distributed earnings to common shareholders 8,016 7,853 16,171 15,699
Less: Distributed earnings to participating securities 47 47 89 87
Undistributed earnings 7,585 7,454 11,537 10,589
Undistributed earnings allocated to common shareholders 7,541 7,411 11,474 10,530
Undistributed earnings allocated to participating securities 44 43 63 59
Total income available to common shareholders, basic $ 15,557 $ 15,264 $ 27,645 $ 26,229
Weighted average Common Shares outstanding, basic (in shares) 37,702 38,781 37,952 38,764
Basic earnings per Common Share (in dollars per share) $ 0.41 $ 0.39 $ 0.73 $ 0.68
Diluted        
Total income available to common shareholders, basic $ 15,557 $ 15,264 $ 27,645 $ 26,229
Undistributed earnings for dilutive stock-based awards 44 43 63 59
Total common shareholders earnings, diluted $ 15,601 $ 15,307 $ 27,708 $ 26,288
Weighted average Common Shares outstanding, basic (in shares) 37,702 38,781 37,952 38,764
Stock-based compensation (in shares) [1] 207 220 201 210
Weighted average common shares outstanding, diluted (in shares) 37,909 39,001 38,153 38,974
Diluted earnings per Common Share (in dollars per share) $ 0.41 $ 0.39 $ 0.73 $ 0.67
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 187,152 and 245,784 stock options at June 30, 2015 and 2014, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 225,074 and 239,226 restricted stock units at June 30, 2015 and 2014, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2015 and 2014.