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SUMMARY OF QUARTERLY OPERATIONS - UNAUDITED (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Mar. 07, 2017 | Nov. 02, 2016 | Aug. 05, 2016 | May 10, 2016 | Feb. 24, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 88,286 | $ 89,301 | $ 81,344 | $ 83,098 | $ 83,950 | $ 85,441 | $ 89,366 | $ 82,402 | $ 342,029 | $ 341,159 | $ 324,705
Cost of sales |  |  |  |  |  | (24,607) | (23,505) | (21,197) | (21,728) | (24,327) | (21,512) | (23,078) | (22,020) | (91,037) | (90,937) | (85,345)
Gross profit |  |  |  |  |  | 63,679 | 65,796 | 60,147 | 61,370 | 59,623 | 63,929 | 66,288 | 60,382 | 250,992 | 250,222 | 239,360
Volume incentives |  |  |  |  |  | 31,983 | 30,716 | 28,288 | 28,983 | 29,558 | 29,684 | 30,791 | 29,877 | 119,970 | 119,910 | 117,786
Selling, general and administrative |  |  |  |  |  | 34,537 | 32,926 | 31,836 | 30,336 | 31,452 | 29,187 | 31,249 | 28,385 | 129,635 | 120,273 | 107,702
Operating income (loss) |  |  |  |  |  | (2,841) | 2,154 | 23 | 2,051 | (1,387) | 5,058 | 4,248 | 2,120 | 1,387 | 10,039 | 13,872
Other income (expense) |  |  |  |  |  | (74) | 193 | 441 | 1,275 | (1,730) | 20 | (622) | 1,559 | 1,835 | (773) | (592)
Income from continuing operations before provision for income taxes |  |  |  |  |  | (2,915) | 2,347 | 464 | 3,326 | (3,117) | 5,078 | 3,626 | 3,679 | 3,222 | 9,266 | 13,280
Provision for income taxes |  |  |  |  |  | 14,693 | (1) | 884 | 1,463 | 4,305 | 1,136 | 1,260 | 1,890 | 17,039 | 8,591 | 1,740
Net income (loss) |  |  |  |  |  | (17,608) | 2,348 | (420) | 1,863 | (7,422) | 3,942 | 2,366 | 1,789 | (13,817) | 675 | 13,656
Net loss attributable to noncontrolling interests |  |  |  |  |  | (250) | (95) | (233) | (297) | (769) | (213) | (202) | (280) | (875) | (1,464) | (1,031)
Net income (loss) attributable to common shareholders |  |  |  |  |  | $ (17,358) | $ 2,443 | $ (187) | $ 2,160 | $ (6,653) | $ 4,155 | $ 2,568 | $ 2,069 | $ (12,942) | $ 2,139 | $ 14,687
Basic earnings (loss) per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share attributable to common shareholders (in dollars per share) |  |  |  |  |  | $ (0.92) | $ 0.13 | $ (0.01) | $ 0.11 | $ (0.35) | $ 0.22 | $ 0.14 | $ 0.11 | $ (0.69) | $ 0.11 | $ 0.79
Diluted earnings (loss) per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share attributable to common shareholders (in dollars per share) |  |  |  |  |  | (0.92) | 0.13 | (0.01) | 0.11 | (0.35) | 0.22 | 0.14 | 0.11 | (0.69) | 0.11 | 0.77
Dividends declared per common share (in dollars per share) | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0 | $ 0 | $ 0 | $ 0.1 | $ 0.1000 | $ 0.1000 | $ 0.1000 | $ 0.1000 | $ 0.10 | $ 0.4 | $ 0.4

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