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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.

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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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