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Unaudited Quarterly Financial Data (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Unaudited Quarterly Financial Data [Abstract]                      
Net sales $ 129,077,000 $ 124,113,000 $ 127,939,000 $ 91,668,000 $ 119,714,000 $ 102,878,000 $ 110,261,000 $ 94,695,000 $ 472,797,000 $ 427,548,000 $ 422,058,000
Cost of goods sold 103,127,000 102,952,000 102,228,000 75,316,000 90,621,000 76,817,000 84,234,000 68,843,000 383,623,000 320,515,000 305,168,000
Gross profit 25,950,000 21,161,000 25,711,000 16,352,000 29,093,000 26,061,000 26,027,000 25,852,000 89,174,000 107,033,000 116,890,000
Operating expenses [Abstract]                      
General and administrative 12,553,000 12,331,000 8,997,000 12,091,000 9,059,000 11,915,000 8,615,000 5,888,000 45,972,000 35,477,000 31,125,000
Sales and marketing 5,464,000 5,149,000 4,537,000 4,392,000 4,131,000 4,048,000 3,457,000 3,394,000 19,542,000 15,030,000 12,126,000
Research and development 2,440,000 2,054,000 1,784,000 1,736,000 1,772,000 1,678,000 1,240,000 1,002,000 8,014,000 5,692,000 3,824,000
Total operating expenses 20,457,000 19,534,000 15,318,000 18,219,000 14,962,000 17,641,000 13,312,000 10,284,000 73,528,000 56,199,000 47,075,000
Operating income 5,493,000 1,627,000 10,393,000 (1,867,000) 14,131,000 8,420,000 12,715,000 15,568,000 15,646,000 50,834,000 69,815,000
Other expense [Abstract]                      
Interest expense, net 6,689,000 5,764,000 5,699,000 5,075,000 4,656,000 3,953,000 3,522,000 3,314,000 23,227,000 15,445,000 13,094,000
(Loss) income before income tax expense (1,196,000) (4,137,000) 4,694,000 (6,942,000) 9,475,000 4,467,000 9,193,000 12,254,000 (7,581,000) 35,389,000 56,721,000
Income tax (benefit) expense 1,569,000 (1,035,000) 1,181,000 (1,447,000) 1,099,000 6,994,000 3,598,000 4,434,000 268,000 16,125,000 17,986,000
Net (loss) income $ (2,765,000) $ (3,102,000) $ 3,513,000 $ (5,495,000) $ 8,376,000 $ (2,527,000) $ 5,595,000 $ 7,820,000 $ (7,849,000) $ 19,264,000 $ 38,735,000
Basic net (loss) income per share (in dollars per share) $ (0.15) $ (0.16) $ 0.19 $ (0.29) $ 0.44 $ (0.13) $ 0.30 $ 0.42 $ (0.42) $ 1.02 $ 2.08
Diluted net (loss) income per share (in dollars per share) $ (0.15) $ (0.16) $ 0.18 $ (0.29) $ 0.43 $ (0.13) $ 0.29 $ 0.40 $ (0.42) $ 0.99 $ 1.99