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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basic |  |  |  |  |
Net income |  | $ 22,952 | $ 21,006 | $ 50,082 | $ 56,499
Less: (a) Distributed earnings to common shareholders |  | 10,102 | 9,349 | 28,831 | 27,064
Less: Distributed earnings to participating securities |  | 54 | 50 | 151 | 139
Undistributed earnings |  | 12,796 | 11,607 | 21,100 | 29,296
(b) Undistributed earnings allocated to common shareholders |  | 12,727 | 11,546 | 20,991 | 29,147
Undistributed earnings allocated to participating securities |  | 69 | 61 | 109 | 149
Common shareholders earnings, basic |  | $ 22,829 | $ 20,895 | $ 49,822 | $ 56,211
Weighted average Common Shares outstanding, basic |  | 36,737 | 36,659 | 36,728 | 36,625
Basic earnings per Common Share (in dollars per share) |  | $ 0.62 | $ 0.57 | $ 1.36 | $ 1.53
Diluted |  |  |  |  |
Common shareholders earnings, basic |  | $ 22,829 | $ 20,895 | $ 49,822 | $ 56,211
Undistributed earnings for dilutive stock-based awards |  | 69 | 61 | 109 | 149
Total common shareholders earnings, diluted |  | $ 22,898 | $ 20,956 | $ 49,931 | $ 56,360
Weighted average Common Shares outstanding, basic |  | 36,737 | 36,659 | 36,728 | 36,625
Stock-based compensation (in shares) | [1] | 213 | 197 | 207 | 188
Weighted average common shares outstanding, diluted |  | 36,950 | 36,856 | 36,935 | 36,813
Diluted earnings per Common Share (in dollars per share) |  | $ 0.62 | $ 0.57 | $ 1.35 | $ 1.53
[1] | In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 47,792 and 70,702 stock options at September 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 198,613 and 195,457 restricted stock units at September 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2018 and 2017.

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