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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic        
Net income $ 16,742 $ 15,648 $ 26,892 $ 27,797
Less: Distributed earnings to common shareholders 8,188 8,016 16,369 16,171
Less: Distributed earnings to participating securities 50 47 94 89
Undistributed earnings 8,504 7,585 10,429 11,537
Undistributed earnings allocated to common shareholders 8,453 7,541 10,369 11,474
Undistributed earnings allocated to participating securities 51 44 60 63
Total income available to common shareholders, basic $ 16,641 $ 15,557 $ 26,738 $ 27,645
Weighted average Common Shares outstanding, basic (in shares) 36,554 37,702 36,538 37,952
Basic earnings per Common Share (in dollars per share) $ 0.46 $ 0.41 $ 0.73 $ 0.73
Diluted        
Total income available to common shareholders, basic $ 16,641 $ 15,557 $ 26,738 $ 27,645
Undistributed earnings for dilutive stock-based awards 51 44 60 63
Total common shareholders earnings, diluted $ 16,692 $ 15,601 $ 26,798 $ 27,708
Weighted average Common Shares outstanding, basic (in shares) 36,554 37,702 36,538 37,952
Stock-based compensation (in shares) [1] 198 207 192 201
Weighted average common shares outstanding, diluted (in shares) 36,752 37,909 36,730 38,153
Diluted earnings per Common Share (in dollars per share) $ 0.45 $ 0.41 $ 0.73 $ 0.73
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 142,402 and 187,152 stock options at June 30, 2016 and 2015, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 227,364 and 225,074 restricted stock units at June 30, 2016 and 2015, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2016 and 2015.