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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.