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Unaudited Quarterly Financial Data (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Unaudited Quarterly Financial Data [Abstract]                      
Net sales $ 121,108,000 $ 100,127,000 $ 111,774,000 $ 95,063,000 $ 114,410,000 $ 112,595,000 $ 108,836,000 $ 85,412,000 $ 428,072,000 $ 421,253,000 $ 368,970,000
Cost of goods sold 90,780,000 77,583,000 84,612,000 69,224,000 82,783,000 80,225,000 78,178,000 65,021,000 322,199,000 306,207,000 268,046,000
Gross profit 30,328,000 22,544,000 27,162,000 25,839,000 31,627,000 32,370,000 30,658,000 20,391,000 105,873,000 115,046,000 100,924,000
Operating expenses [Abstract]                      
General and administrative 8,810,000 11,915,000 8,615,000 6,187,000 9,678,000 7,952,000 9,869,000 3,625,000 35,527,000 31,124,000 49,665,000
Sales and marketing 4,131,000 4,048,000 3,457,000 3,394,000 3,551,000 3,234,000 2,707,000 2,634,000 15,030,000 12,126,000 9,965,000
Research and development 1,772,000 1,678,000 1,240,000 1,002,000 1,011,000 1,039,000 905,000 869,000 5,692,000 3,824,000 3,008,000
Total operating expenses 14,713,000 17,641,000 13,312,000 10,583,000 14,240,000 12,225,000 13,481,000 7,128,000 56,249,000 47,074,000 62,638,000
Operating income 15,615,000 4,903,000 13,850,000 15,256,000 17,387,000 20,145,000 17,177,000 13,263,000 49,624,000 67,972,000 38,286,000
Other expense [Abstract]                      
Interest expense, net 4,656,000 3,953,000 3,522,000 3,314,000 3,729,000 3,357,000 3,189,000 2,819,000 15,445,000 13,094,000 16,244,000
Income before income tax expense 10,959,000 950,000 10,328,000 11,942,000 13,658,000 16,788,000 13,988,000 10,444,000 34,179,000 54,878,000 22,042,000
Income tax expense 1,764,000 7,756,000 4,027,000 4,316,000 3,846,000 5,678,000 4,845,000 2,936,000 17,863,000 17,305,000 11,479,000
Net income (loss) $ 9,195,000 $ (6,806,000) $ 6,301,000 $ 7,626,000 $ 9,812,000 $ 11,110,000 $ 9,143,000 $ 7,508,000 $ 16,316,000 $ 37,573,000 $ 10,563,000
Basic net income (loss) per share (in dollars per share) $ 0.48 $ (0.36) $ 0.34 $ 0.41 $ 0.53 $ 0.59 $ 0.49 $ 0.40 $ 0.87 $ 2.02 $ 0.58
Diluted net income (loss) per share (in dollars per share) $ 0.47 $ (0.36) $ 0.33 $ 0.39 $ 0.50 $ 0.57 $ 0.47 $ 0.39 $ 0.84 $ 1.93 $ 0.55