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Earnings per Share/Capital Stock: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Basic |  |  |  |
Net income | $ 11,021 |  | $ 13,465 |
Less: Distributed earnings to common shareholders | 7,846 |  | 6,839 |
Less: Distributed earnings to participating securities | 43 |  | 45 |
Undistributed earnings | 3,132 |  | 6,581 |
Undistributed earnings allocated to common shareholders | 3,114 |  | 6,539 |
Undistributed earnings allocated to participating securities | 18 |  | 42 |
Total income available to common shareholders, basic | 10,960 |  | 13,378 |
Weighted average Common Shares outstanding, basic (in shares) | 38,747 |  | 38,529 |
Basic earnings per Common Share (in dollars per share) | $ 0.28 |  | $ 0.35 |
Diluted |  |  |  |
Total income available to common shareholders, basic | 10,960 |  | 13,378 |
Undistributed earnings for dilutive stock options | 18 |  | 42 |
Total common shareholders earnings, diluted | $ 10,978 |  | $ 13,420 |
Weighted average Common Shares outstanding, basic (in shares) | 38,747 |  | 38,529 |
Stock-based compensation (in shares) | 197 | [1] | 243 | [1]
Weighted average common shares outstanding, diluted (in shares) | 38,944 |  | 38,772 |
Diluted earnings per Common Share (in dollars per share) | $ 0.28 |  | $ 0.35 |
[1] | In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 247,064 stock options and 352,096 restricted stock units at March 31, 2014 and 2013, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 237,174 and 290,416 restricted stock units at March 31, 2014 and 2013, respectively, were included in the calculation of diluted EPS for the three months ended March 31, 2014 and 2013.

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