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Earnings per Share/Capital Stock: (Details 2) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 20, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Additional disclosure |  |  |  |  |  |
Options outstanding (in shares) |  | 140,834 | 519,273 | 140,834 | 519,273 |
Stock options included in the calculation of diluted EPS (in shares) |  |  |  | 140,834 | 410,760 |
Stock options not included in the calculation of diluted EPS (in shares) |  | 0 | 108,013 | 0 | 108,013 |
Anti-dilutive stock options not included in the computation of diluted EPS (in shares) |  |  |  | 0 | 500 |
Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  |  | 104,493 | 131,581 |
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  |  | $ 1,832,000 | $ 2,748,000 |
Common Shares repurchased in the open market under DRP and 401(k) Plan |  |  |  | 240,612 | 408,962 |
Dividends paid |  | $ 6,800,000 | $ 5,300,000 | $ 13,684,000 | $ 10,559,000 |
Quarterly dividends paid, per share of common stock (in dollars per share) |  | $ 0.355 | $ 0.28 | $ 0.71 | $ 0.56 |
Dividends declared per share (in dollars per share) | $ 0.405 |  |  |  |  |
Stock split, conversion ratio | 2 |  |  |  |  |
Common stock, shares outstanding |  | 19,300,000 |  | 19,300,000 |  | 19,200,000
Restricted Stock Units |  |  |  |  |  |
Additional disclosure |  |  |  |  |  |
Restricted stock units outstanding (in shares) |  | 130,453 | 147,109 | 130,453 | 147,109 |
Pro Forma |  |  |  |  |  |
Additional disclosure |  |  |  |  |  |
Common stock, shares outstanding |  | 38,700,000 |  | 38,700,000 |  | 38,500,000

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