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Earnings per Share/Capital Stock: (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Basic        
Net income $ 21,171 $ 20,839 $ 47,546 $ 50,906
Less: Distributed earnings to common shareholders 8,244 7,836 23,944 21,527
Less: Distributed earnings to participating securities 48 48 133 123
Undistributed earnings 12,879 12,955 23,469 29,256
Undistributed earnings allocated to common shareholders 12,805 12,877 23,340 29,089
Undistributed earnings allocated to participating securities 74 78 129 167
Total income available to common shareholders, basic 21,049 20,713 47,284 50,616
Weighted average Common Shares outstanding, basic (in shares) 38,704 38,696 38,744 38,613
Basic earnings per Common Share (in dollars per share) $ 0.54 $ 0.54 $ 1.22 $ 1.31
Diluted        
Total income available to common shareholders, basic 21,049 20,713 47,284 50,616
Undistributed earnings for dilutive stock options 74 78 129 167
Total common shareholders earnings, diluted $ 21,123 $ 20,791 $ 47,413 $ 50,783
Weighted average Common Shares outstanding, basic (in shares) 38,704 38,696 38,744 38,613
Stock-based compensation (in shares) 226 [1] 227 [1] 219 [1] 222 [1]
Weighted average common shares outstanding, diluted (in shares) 38,930 38,923 38,963 38,835
Diluted earnings per Common Share (in dollars per share) $ 0.54 $ 0.53 $ 1.22 $ 1.31
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 235,584 and 273,740 stock options at September 30, 2014 and 2013, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 224,543 and 236,891 restricted stock units at September 30, 2014 and 2013, respectively, were included in the calculation of diluted EPS for the nine months ended September 30, 2014 and 2013.