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Earnings Per Share - (Tables)
3 Months Ended
Aug. 01, 2015
Earnings Per Share Disclosure [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended  Six Months Ended
    August 1, 2015  August 2, 2014  August 1, 2015  August 2, 2014
  (Dollars in thousands)
Numerator            
 Net earnings $ 15,594 $ 15,651 $ 46,677 $ 45,658
 Earnings allocated to non-vested equity awards  (335)  (323)  (961)  (860)
 Net earnings available to common stockholders $ 15,259 $ 15,328 $ 45,716 $ 44,798
              
Denominator            
 Basic weighted average common shares outstanding  27,452,199  27,357,829  27,410,674  27,846,611
 Dilutive effect of stock options  5,739  2,516  5,916  1,654
 Diluted weighted average common shares outstanding  27,457,938  27,360,345  27,416,590  27,848,265
              
Net income per common share            
 Basic earnings per share (Class A and B Shares) $ 0.56 $ 0.56 $ 1.67 $ 1.61
 Diluted earnings per share (Class A and B Shares) $ 0.56 $ 0.56 $ 1.67 $ 1.61