Summary of Significant Accounting Policies - Summary of Impacts of ASC 842 on Condensed Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net sales	$ 134,285	$ 140,560	$ 273,400	$ 293,128
Cost of sales	87,349	92,569	180,905	198,022
Gross profit	46,936	47,991	92,495	95,106
Selling, general and administrative expenses	36,809	34,506	71,277	69,979
(Gain) loss on disposal of fixed assets	(55)	66	(98)	(314)
Impairment charges	0	308	916	308
Operating income	10,182	13,111	20,400	25,133
Interest expense, net	(1,017)	(1,313)	(2,066)	(2,952)
Income from continuing operations before income taxes	9,165	11,798	18,334	22,181
Income tax expense	2,559	3,190	5,085	5,818
Income from continuing operations	6,606	$ 8,608	13,249	$ 16,363
Assets
Right of use asset - operating leases	5,983		5,983			$ 0
Deferred income taxes	6,490		6,490			5,270
Liabilities
Other current liabilities	14,639		14,639			16,701
Operating lease liability - short-term	2,000		2,000			0
Operating lease liability - long-term	4,225		4,225			0
Other liabilities	22,813		22,813			19,794
Shareholders’ Equity
Retained deficit	(136,557)		(136,557)			$ (141,187)
ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net sales	134,285		273,400
Cost of sales	87,349		180,905
Gross profit	46,936		92,495
Selling, general and administrative expenses	36,809		71,277
(Gain) loss on disposal of fixed assets	(55)		(98)
Impairment charges			916
Operating income	10,182		20,400
Interest expense, net	1,017		2,066
Income from continuing operations before income taxes	9,165		18,334
Income tax expense	2,559		5,085
Income from continuing operations	6,606		13,249
Assets
Right of use asset - operating leases	5,983		5,983		$ 5,900
Deferred income taxes	6,490		6,490
Liabilities
Other current liabilities	14,639		14,639
Operating lease liability - short-term	2,000		2,000
Operating lease liability - long-term	4,225		4,225
Other liabilities	22,813		22,813
Shareholders’ Equity
Retained deficit	(136,557)		(136,557)
Adjustments [Member] | ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Selling, general and administrative expenses	(34)		(67)
Operating income	34		67
Income from continuing operations before income taxes	34		67
Income tax expense	9		18
Income from continuing operations	25		49
Assets
Right of use asset - operating leases	(5,983)		(5,983)
Deferred income taxes	316		316
Liabilities
Other current liabilities	242		242
Operating lease liability - short-term	(2,000)		(2,000)
Operating lease liability - long-term	(4,225)		(4,225)
Other liabilities	1,169		1,169
Shareholders’ Equity
Retained deficit	(853)		(853)
Balances Without Adoption of ASC 842 [Member] | ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net sales	134,285		273,400
Cost of sales	87,349		180,905
Gross profit	46,936		92,495
Selling, general and administrative expenses	36,775		71,210
(Gain) loss on disposal of fixed assets	(55)		(98)
Impairment charges			916
Operating income	10,216		20,467
Interest expense, net	1,017		2,066
Income from continuing operations before income taxes	9,199		18,401
Income tax expense	2,568		5,103
Income from continuing operations	6,631		13,298
Assets
Deferred income taxes	6,806		6,806
Liabilities
Other current liabilities	14,881		14,881
Other liabilities	23,982		23,982
Shareholders’ Equity
Retained deficit	$ (137,410)		$ (137,410)