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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basic |  |  |  |  |
Net income |  | $ 16,348 | $ 22,792 | $ 27,130 | $ 35,493
Weighted Average Dividends Common Stock |  | 9,367 | 8,861 | 18,729 | 17,715
Less: Distributed earnings to participating securities |  | 51 | 48 | 96 | 91
Undistributed earnings |  | 6,930 | 13,883 | 8,305 | 17,687
Undistributed earnings allocated to common shareholders |  | 6,894 | 13,807 | 8,263 | 17,597
Undistributed earnings allocated to participating securities |  | 36 | 76 | 42 | 90
Total income available to common shareholders, basic |  | $ 16,261 | $ 22,668 | $ 26,992 | $ 35,312
Weighted average Common Shares outstanding, basic (in shares) |  | 36,733 | 36,624 | 36,723 | 36,607
Basic earnings per Common Share (in dollars per share) |  | $ 0.44 | $ 0.62 | $ 0.74 | $ 0.96
Diluted |  |  |  |  |
Total income available to common shareholders, basic |  | $ 16,261 | $ 22,668 | $ 26,992 | $ 35,312
Undistributed earnings for dilutive stock-based awards |  | 36 | 76 | 42 | 90
Total common shareholders earnings, diluted |  | $ 16,297 | $ 22,744 | $ 27,034 | $ 35,402
Weighted average Common Shares outstanding, basic (in shares) |  | 36,733 | 36,624 | 36,723 | 36,607
Stock-based compensation (in shares) | [1] | 179 | 201 | 173 | 192
Weighted average common shares outstanding, diluted (in shares) |  | 36,912 | 36,825 | 36,896 | 36,799
Diluted earnings per Common Share (in dollars per share) |  | $ 0.44 | $ 0.62 | $ 0.73 | $ 0.96
[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 91,634 stock options at June 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 204,909 and 208,059 restricted stock units at June 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and six months ended June 30, 2018 and 2017.

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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