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Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Additional disclosure |  |  |  |
Options outstanding (in shares) | 47,792 | 91,634 | 47,792 | 91,634
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 |  |  | 52,712 | 73,398
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | $ 340 | $ 524
Weighted Average Dividends Common Stock | $ 9,367 | $ 8,861 | 18,729 | 17,715
Dividends paid |  |  | $ 18,729 | $ 17,715
Quarterly dividends paid, per share of common stock (in dollars per share) | $ 0.255 | $ 0.242 | $ 0.51 | $ 0.484
Restricted Stock Units |  |  |  |
Additional disclosure |  |  |  |
Restricted stock units outstanding (in shares) | 204,909 | 208,059 | 204,909 | 208,059

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