Annual report pursuant to Section 13 and 15(d)

SUMMARY OF QUARTERLY OPERATIONS - UNAUDITED (Details)

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SUMMARY OF QUARTERLY OPERATIONS - UNAUDITED (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Nov. 02, 2012
Aug. 01, 2012
May 07, 2012
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
SUMMARY OF QUARTERLY OPERATIONS - UNAUDITED                            
Impact of change in accounting principle on cost of sales and selling, general and administrative expenses       $ 5,281                    
Amount of shipping and handling costs reclassified from selling, general and administrative expense to cost of sales         5,431 5,524 5,369 5,061 5,078 4,911 4,949      
Net sales revenue       90,377 91,232 92,991 92,868 92,056 91,102 91,811 92,844 367,468 367,813 349,918
Cost of sales       (23,841) (23,144) (22,610) (23,729) (21,911) (21,957) (22,040) (23,501) (93,324) (89,409) (89,264)
Gross profit       66,536 68,088 70,381 69,139 70,145 69,145 69,771 69,343 274,144 278,404 260,654
Volume incentives       32,991 33,155 33,540 33,581 33,462 32,733 33,390 34,298 133,267 133,883 130,367
Selling, general and administrative       27,719 26,228 26,530 26,384 27,086 26,767 28,329 27,424 106,861 109,606 119,024
Contract termination costs                 14,750       14,750  
Operating income       5,826 8,705 10,311 9,174 9,597 (5,105) 8,052 7,621 34,016 20,165 11,263
Other income (expense)       1,639 (214) 165 (110) 798 1,204 (420) 265 1,480 1,847 2,727
Income before provision for income taxes       7,465 8,491 10,476 9,064 10,395 (3,901) 7,632 7,886 35,496 22,012 13,990
Tax provision (benefit)       2,969 2,121 3,190 1,836 2,774 (1,645) 2,018 1,264 10,116 4,411 5,521
Net income (loss)       $ 4,496 $ 6,370 $ 7,286 $ 7,228 $ 7,621 $ (2,256) $ 5,614 $ 6,622 $ 25,380 $ 17,601 $ (1,233)
Basic:                            
Net income per common share (in dollars per share)       $ 0.28 $ 0.41 $ 0.47 $ 0.46 $ 0.49 $ (0.14) $ 0.36 $ 0.43 $ 1.62 $ 1.13 $ (0.08)
Diluted:                            
Net income per common share (in dollars per share)       $ 0.28 $ 0.40 $ 0.46 $ 0.46 $ 0.48 $ (0.14) $ 0.36 $ 0.43 $ 1.59 $ 1.12 $ (0.08)
Dividends declared per common share (in dollars per share) $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05           $ 0.15