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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
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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 |  |

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