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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Additional disclosure |  |  |  |
Options outstanding (in shares) | 91,634 | 142,402 | 91,634 | 142,402
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 |  |  | 73,398 | 52,212
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | $ 524 | $ 126
Weighted Average Dividends Common Stock | $ 8,861 | $ 8,188 | 17,715 | 16,369
Dividends paid |  |  | $ 17,715 | $ 16,369
Quarterly dividends paid, per share of common stock (in dollars per share) | $ 0.242 | $ 0.2240 | $ 0.484 | $ 0.4480
Restricted Stock Units |  |  |  |
Additional disclosure |  |  |  |
Restricted stock units outstanding (in shares) | 208,059 | 227,364 | 208,059 | 227,364

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