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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Additional disclosure |  |  |  |
Options outstanding (in shares) | 47,792 | 70,702 | 47,792 | 70,702
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 |  |  | 64,245 | 107,815
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | $ 348 | $ 884
Less: (a) Distributed earnings to common shareholders | $ 10,102 | $ 9,349 | 28,831 | 27,064
Dividends paid |  |  | $ 28,831 | $ 27,064
Quarterly dividends paid, per share of common stock (in dollars per share) | $ 0.275 | $ 0.255 | $ 0.785 | $ 0.739
Restricted Stock Units |  |  |  |
Additional disclosure |  |  |  |
Restricted stock units outstanding (in shares) | 198,613 | 195,457 | 198,613 | 195,457

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