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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Statement of Operations (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
Consolidated Statement of Operations [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
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 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 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 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
Historical Misapplication of U.S. GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member]                      
Consolidated Statement of Operations [Abstract]                      
Net sales                   $ 426,991,000 $ 422,882,000
Cost of goods sold                   320,449,000 305,926,000
Gross profit                   106,542,000 116,956,000
Operating expenses [Abstract]                      
General and administrative                   35,477,000 31,125,000
Sales and marketing                   15,030,000 12,126,000
Research and development                   5,692,000 3,824,000
Total operating expenses                   56,199,000 47,075,000
Operating income                   50,343,000 69,881,000
Interest expense, net                   15,445,000 13,094,000
(Loss) income before income tax expense                   34,898,000 56,787,000
Income tax expense                   16,072,000 18,011,000
Net (loss) income                   $ 18,826,000 $ 38,776,000
Basic net income per share (in dollars per share)                   $ 1.00 $ 2.08
Diluted net income per share (in dollars per share)                   $ 0.96 $ 2.00
Historical Misapplication of U.S. GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member]                      
Consolidated Statement of Operations [Abstract]                      
Net sales                   $ 428,072,000 $ 421,253,000
Cost of goods sold                   322,199,000 306,207,000
Gross profit                   105,873,000 115,046,000
Operating expenses [Abstract]                      
General and administrative                   35,527,000 31,124,000
Sales and marketing                   15,030,000 12,126,000
Research and development                   5,692,000 3,824,000
Total operating expenses                   56,249,000 47,074,000
Operating income                   49,624,000 67,972,000
Interest expense, net                   15,445,000 13,094,000
(Loss) income before income tax expense                   34,179,000 54,878,000
Income tax expense                   17,863,000 17,305,000
Net (loss) income                   $ 16,316,000 $ 37,573,000
Basic net income per share (in dollars per share)                   $ 0.87 $ 2.02
Diluted net income per share (in dollars per share)                   $ 0.84 $ 1.93
Historical Misapplication of U.S. GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member]                      
Consolidated Statement of Operations [Abstract]                      
Net sales                   $ (1,081,000) $ 1,629,000
Cost of goods sold                   (1,750,000) (281,000)
Gross profit                   669,000 1,910,000
Operating expenses [Abstract]                      
General and administrative                   (50,000) 1,000
Sales and marketing                   0 0
Research and development                   0 0
Total operating expenses                   (50,000) 1,000
Operating income                   719,000 1,909,000
Interest expense, net                   0 0
(Loss) income before income tax expense                   719,000 1,909,000
Income tax expense                   (1,791,000) 706,000
Net (loss) income                   $ 2,510,000 $ 1,203,000
Basic net income per share (in dollars per share)                   $ 0.13 $ 0.06
Diluted net income per share (in dollars per share)                   $ 0.13 $ 0.06