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Earnings per Share/Capital Stock: (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Basic        
Net income $ 15,354 $ 16,602 $ 26,375 $ 30,067
Less: Distributed earnings to common shareholders 7,853 6,854 15,699 13,693
Less: Distributed earnings to participating securities 47 95 87 181
Undistributed earnings 7,454 9,653 10,589 16,193
Undistributed earnings allocated to common shareholders 7,411 9,522 10,530 15,982
Undistributed earnings allocated to participating securities 43 131 59 211
Total income available to common shareholders, basic 15,264 16,376 26,229 29,675
Weighted average Common Shares outstanding, basic (in shares) 38,781 38,612 38,764 38,570
Basic earnings per Common Share (in dollars per share) $ 0.39 $ 0.43 $ 0.68 $ 0.77
Diluted        
Total income available to common shareholders, basic 15,264 16,376 26,229 29,675
Undistributed earnings for dilutive stock options 43 0 59 0
Total common shareholders earnings, diluted $ 15,307 $ 16,376 $ 26,288 $ 29,675
Weighted average Common Shares outstanding, basic (in shares) 38,781 38,612 38,764 38,570
Stock-based compensation (in shares) 220 [1] 80 [1] 210 [1] 78 [1]
Weighted average common shares outstanding, diluted (in shares) 39,001 38,692 38,974 38,648
Diluted earnings per Common Share (in dollars per share) $ 0.39 $ 0.43 $ 0.67 $ 0.77
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 245,784 and 281,668 stock options at June 30, 2014 and 2013, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 239,226 and 260,906 restricted stock units at June 30, 2014 and 2013, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2014 and 2013.