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SELECTED QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 135,246 | $ 144,161 | $ 145,658 | $ 142,015 | [1] | $ 148,650 | [2] | $ 156,341 | $ 99,439 | $ 82,646 | $ 567,080 | $ 487,076 | $ 349,189
Cost of sales | 109,203 | 116,749 | 117,098 | 115,202 | [1] | 121,091 | [2] | 128,561 | 81,493 | 68,576 | 458,253 | 399,721 | 286,952
Net earnings | $ 2,895 | $ 4,920 | $ 6,062 | 5,320 | [1] | 1,774 | [2] | $ 1,261 | $ 3,065 | $ 2,503 | 19,197 | 8,603 | 15,908
Measurement Period Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  | 114,900 |  | 120,800 |  |  |  |  |  |  |
Net earnings |  |  |  | $ 5,600 |  | $ 2,000 |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  |  | $ 3,331 | $ 1,492 | $ 2,868
Net earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.23 | $ 0.39 | $ 0.49 | $ 0.43 | [1] | $ 0.14 | [2] | $ 0.10 | $ 0.25 | $ 0.20 | $ 1.53 | $ 0.69 | $ 1.32
Class A [Member] | Measurement Period Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) |  |  |  | 0.45 |  | 0.16 |  |  |  |  |  |  |
Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  |  | $ 15,866 | $ 7,111 | $ 13,040
Net earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.25 | $ 0.42 | $ 0.52 | 0.45 | [1] | 0.15 | [2] | $ 0.11 | $ 0.27 | $ 0.22 | $ 1.64 | $ 0.75 | $ 1.41
Class B [Member] | Measurement Period Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) |  |  |  | $ 0.48 |  | $ 0.17 |  |  |  |  |  |  |
[1] | Revised from 10-Q disclosures to reflect immaterial measurement period adjustments related to the 2014 Acquisitions. First quarter 10-Q reflected cost of sales of $114.9 million, net earnings of $5.6 million, earnings per Class A common share of $0.45 per share and earnings per Class B common share of $0.48 per share.
[2] | Revised from the disclosure in the Annual Report on Form 10-K for the year ended December 31, 2014 to reflect immaterial measurement period adjustments related to the 2014 Acquisitions. The 2014 10-K reflected, for the fourth quarter of 2014, cost of sales of $120.8 million, net earnings of $2.0 million, earnings per Class A common share of $0.16 per share and earnings per Class B common share of $0.17 per share.

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