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Earnings per Share/Capital Stock: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic    
Net income $ 10,150 $ 12,149
Less: Distributed earnings to common shareholders 8,181 8,138
Less: Distributed earnings to participating securities 45 45
Undistributed earnings 1,924 3,966
Undistributed earnings allocated to common shareholders 1,914 3,945
Undistributed earnings allocated to participating securities 10 21
Total income available to common shareholders, basic $ 10,095 $ 12,083
Weighted average Common Shares outstanding, basic (in shares) 36,521 38,205
Basic earnings per Common Share (in dollars per share) $ 0.28 $ 0.32
Diluted    
Total income available to common shareholders, basic $ 10,095 $ 12,083
Undistributed earnings for dilutive stock-based awards 10 21
Total common shareholders earnings, diluted $ 10,105 $ 12,104
Weighted average Common Shares outstanding, basic (in shares) 36,521 38,205
Stock-based compensation (in shares) [1] 176 203
Weighted average common shares outstanding, diluted (in shares) 36,697 38,408
Diluted earnings per Common Share (in dollars per share) $ 0.28 $ 0.32
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 142,402 and 198,764 stock options at March 31, 2016 and 2015, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 215,129 and 226,319 restricted stock units at March 31, 2016 and 2015, respectively, were included in the calculation of diluted EPS for the three months ended March 31, 2016 and 2015.