Revision of Prior Period Financial Statements - Revised Consolidated Statements of Income Amounts (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 319,074	$ 287,688	$ 283,861	$ 267,211	$ 293,977	$ 270,844	$ 281,988	$ 274,297	$ 551,072	$ 556,285	$ 838,760	$ 827,129	$ 1,157,834	$ 1,121,106	$ 1,138,370
Cost of goods sold		218,193	215,463	205,201	234,911	206,877	217,047	208,458	420,664	425,505	638,857	632,382	895,825	867,293	862,862
Gross profit	62,106	69,495	68,398	62,010	59,066	63,967	64,941	65,839	130,408	130,780	199,903	194,747	262,009	253,813	275,508
Selling, general and administrative expenses		59,751	57,404	55,830	62,124	56,167	59,050	61,196	113,235	120,246	172,986	176,413	222,721	238,537	227,895
Restructuring charges		2,892									10,524		15,918	6,031	0
(Loss) income from operations	3,588	3,762	4,063	(371)	(28,232)	(43,312)	2,377	984	3,692	3,361	7,454	(39,951)	11,042	(68,183)	33,546
Other, net		(1,735)	279	(440)					(161)		(1,896)		(3,686)	(1,616)	(1,788)
Total other expense		(6,074)	(2,103)	(3,087)					(5,191)		(11,265)		(17,417)	(9,147)	(6,420)
(Loss) income before income taxes		(2,312)	1,960	(3,458)	(30,926)	(45,363)	326	(1,368)	(1,499)	(1,042)	(3,811)	(46,404)	(6,375)	(77,330)	27,126
Provision (benefit) for income tax		(1,250)	2,468	(1,414)	(1,536)	(243)	625	506	1,053	1,131	(197)	889	3,700	(647)	11,257
Net loss	$ (6,461)	$ (1,062)	$ (508)	$ (2,044)	$ (29,390)	$ (45,120)	$ (299)	$ (1,874)	$ (2,552)	$ (2,173)	$ (3,614)	$ (47,293)	$ (10,075)	$ (76,683)	$ 15,869
Basic (loss) earnings per share (in USD per share)		$ (0.02)	$ (0.01)	$ (0.04)	$ (0.57)	$ (0.87)	$ (0.01)	$ (0.03)	$ (0.05)	$ (0.04)	$ (0.07)	$ (0.90)	$ (0.19)	$ (1.47)	$ 0.29
Diluted (loss) earnings per share (in USD per share)		$ (0.02)	$ (0.01)	$ (0.04)	$ (0.57)	$ (0.87)	$ (0.01)	$ (0.03)	$ (0.05)	$ (0.04)	$ (0.07)	$ (0.90)	$ (0.19)	$ (1.47)	$ 0.29
Comprehensive income (loss)		$ (2,798)	$ (255)	$ (1,297)	$ (30,519)	$ (46,829)	$ (5,906)	$ 1,490	$ (1,552)	$ (4,416)	$ (4,350)	$ (51,244)	$ (8,213)	$ (81,765)	$ 17,589
Adjusted EBITDA													$ 49,045	27,315	57,494
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		286,525	284,053	267,239	294,195	270,850	281,967	274,539	551,291	556,506	837,816	827,356		1,121,551	1,138,361
Cost of goods sold		218,356	214,986	206,043	234,077	206,808	217,096	208,472	421,029	425,568	639,385	632,376		866,453	862,903
Gross profit		68,169	69,067	61,196	60,118	64,042	64,871	66,067	130,262	130,938	198,431	194,980		255,098	275,458
Selling, general and administrative expenses		59,938	58,661	55,805	62,812	56,142	59,002	61,167	114,466	120,169	174,404	176,312		239,124	227,253
Restructuring charges		3,055									10,687
(Loss) income from operations		2,086	3,475	(1,160)	(27,868)	(43,212)	2,355	1,241	2,315	3,596	4,401	(39,617)		(67,485)	34,138
Other, net		(1,736)	279	(740)					(460)		(2,196)
Total other expense		(6,075)	(2,103)	(3,387)					(5,490)		(11,565)
(Loss) income before income taxes		(3,989)	1,372	(4,547)	(30,562)	(45,263)	304	(1,111)	(3,175)	(807)	(7,164)	(46,070)		(76,632)	27,718
Provision (benefit) for income tax		(1,815)	2,541	(2,085)	(1,312)	(326)	603	573	456	1,176	(1,359)	851		(461)	11,288
Net loss		$ (2,174)	$ (1,169)	$ (2,462)	$ (29,250)	$ (44,937)	$ (299)	$ (1,684)	$ (3,631)	$ (1,983)	$ (5,805)	$ (46,921)		$ (76,171)	$ 16,430
Basic (loss) earnings per share (in USD per share)		$ (0.04)	$ (0.02)	$ (0.05)	$ (0.56)	$ (0.87)	$ (0.01)	$ (0.03)	$ (0.07)	$ (0.04)	$ (0.11)	$ (0.90)		$ (1.46)	$ 0.31
Diluted (loss) earnings per share (in USD per share)		$ (0.04)	$ (0.02)	$ (0.05)	$ (0.56)	$ (0.87)	$ (0.01)	$ (0.03)	$ (0.07)	$ (0.04)	$ (0.11)	$ (0.90)		$ (1.46)	$ 0.30
Comprehensive income (loss)		$ (3,910)	$ (916)	$ (1,715)	$ (30,379)	$ (46,646)	$ (5,906)	$ 1,680	$ (2,631)	$ (4,226)	$ (6,541)	$ (50,872)		$ (81,251)	$ 18,150
Adjusted EBITDA														27,900	57,883
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		1,163	(192)	(28)	(218)	(6)	21	(242)	(219)	(221)	944	(227)		(445)	9
Cost of goods sold		(163)	477	(842)	834	69	(49)	(14)	(365)	(63)	(528)	6		840	(41)
Gross profit		1,326	(669)	814	(1,052)	(75)	70	(228)	146	(158)	1,472	(233)		(1,285)	50
Selling, general and administrative expenses		(187)	(1,257)	25	(688)	25	48	29	(1,231)	77	(1,418)	101		(587)	642
Restructuring charges		(163)									(163)
(Loss) income from operations		1,676	588	789	(364)	(100)	22	(257)	1,377	(235)	3,053	(334)		(698)	(592)
Other, net		1	0	300					299		300
Total other expense		1	0	300					299		300
(Loss) income before income taxes		1,677	588	1,089	(364)	(100)	22	(257)	1,676	(235)	3,353	(334)		(698)	(592)
Provision (benefit) for income tax		565	(73)	671	(224)	83	22	(67)	597	(45)	1,162	38		(186)	(31)
Net loss		$ 1,112	$ 661	$ 418	$ (140)	$ (183)	$ 0	$ (190)	$ 1,079	$ (190)	$ 2,191	$ (372)		$ (512)	$ (561)
Basic (loss) earnings per share (in USD per share)		$ 0.02	$ 0.01	$ 0.01	$ (0.01)	$ 0	$ 0	$ 0	$ 0.02	$ 0	$ 0.04	$ 0		$ (0.01)	$ (0.02)
Diluted (loss) earnings per share (in USD per share)		$ 0.02	$ 0.01	$ 0.01	$ (0.01)	$ 0	$ 0	$ 0	$ 0.02	$ 0	$ 0.04	$ 0		$ (0.01)	$ (0.01)
Comprehensive income (loss)		$ 1,112	$ 661	$ 418	$ (140)	$ (183)	$ 0	$ (190)	$ 1,079	$ (190)	$ 2,191	$ (372)		$ (514)	$ (561)
Adjusted EBITDA														$ (585)	$ (389)