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Earnings per Share/Capital Stock: (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |
Payments Related to Tax Withholding for Share-based Compensation | $ 1,569 | $ 1,210
Basic |  |
Net income | $ 12,852 | $ 10,782
Dividends Declared Per Common Share (in dollars per share) | $ 0.275 | $ 0.255
Weighted Average Dividends Common Stock | $ 10,113 | $ 9,362
Less: Distributed earnings to participating securities | 47 | 46
Undistributed earnings | 2,692 | 1,374
Undistributed earnings allocated to common shareholders | 2,679 | 1,367
Undistributed earnings allocated to participating securities | 13 | 7
Total income available to common shareholders, basic | $ 12,792 | $ 10,729
Weighted average Common Shares outstanding, basic (in shares) | 36,773 | 36,712
Basic earnings per Common Share (in dollars per share) | $ 0.35 | $ 0.29
Diluted |  |
Total income available to common shareholders, basic | $ 12,792 | $ 10,729
Undistributed earnings for dilutive stock-based awards | 13 | 8
Total common shareholders earnings, diluted | $ 12,805 | $ 10,737
Weighted average Common Shares outstanding, basic (in shares) | 36,773 | 36,712
Stock-based compensation (in shares) | 178 | 162
Weighted average common shares outstanding, diluted (in shares) | 36,951 | 36,874
Diluted earnings per Common Share (in dollars per share) | $ 0.35 | $ 0.29

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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