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Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Additional disclosure |  |  |  |
Options outstanding (in shares) | 70,702 | 138,060 | 70,702 | 138,060
Anti-dilutive stock options not included in the computation of diluted EPS (in shares) | 0 |  | 0 | 0
Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | 107,815 | 67,832
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | $ 884 | $ 210
Weighted Average Dividends Common Stock | $ 9,349 | $ 8,189 | 27,064 | 24,558
Dividends paid |  |  | $ 27,064 | $ 24,558
Quarterly dividends paid, per share of common stock (in dollars per share) | $ 0.255 | $ 0.224 | $ 0.739 | $ 0.672
Restricted Stock Units |  |  |  |
Additional disclosure |  |  |  |
Restricted stock units outstanding (in shares) | 195,457 | 216,733 | 195,457 | 216,733

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