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Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Additional disclosure |  |
Options outstanding (in shares) | 120,138 | 142,402
Stock options not included in the calculation of diluted EPS (in shares) |  | 0
Anti-dilutive stock options not included in the computation of diluted EPS (in shares) | 0 | 0
Common Shares issued under DRP and the 2000 and 2008 Employee Plans | 44,832 | 52,153
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | $ 35 | $ 126
Dividends paid | $ 8,854 | $ 8,181
Quarterly dividends paid, per share of common stock (in dollars per share) | $ 0.242 | $ 0.224
Restricted Stock Units |  |
Additional disclosure |  |
Restricted stock units outstanding (in shares) | 194,031 | 215,129

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