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Summary of Significant Accounting Policies - Condensed Statements of Operations, Pro Forma Amounts Under Previous Guidance (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 170,303	$ 182,717	$ 162,523	$ 164,698	$ 181,152	$ 175,652	$ 177,580	$ 161,406	$ 680,241	$ 695,790	$ 651,371
Cost of sales									538,437	530,083	487,247
Selling, general and administrative expenses									119,654	127,476	114,384
Provision for income taxes									14,242	17,611	4,804
Net income	$ (11,107)	$ 959	$ 22,659	$ (587)	$ (16,854)	$ 1,728	$ 4,684	$ 119	$ 11,924	$ (10,323)	$ 20,384
Earnings per share:
Basic (in dollars per share)	$ (0.80)	$ 0.07	$ 1.61	$ (0.04)	$ (1.19)	$ 0.12	$ 0.33	$ 0.01	$ 0.85	$ (0.72)	$ 1.41
Diluted (in dollars per share)	$ (0.80)	$ 0.07	$ 1.60	$ (0.04)	$ (1.19)	$ 0.12	$ 0.32	$ 0.01	$ 0.85	$ (0.72)	$ 1.38
Without Adoption of ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales									$ 684,043
Cost of sales									541,731
Selling, general and administrative expenses									119,646
Provision for income taxes									14,375
Net income									$ 12,307
Earnings per share:
Basic (in dollars per share)									$ 0.88
Diluted (in dollars per share)									$ 0.88
Effect of Change | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales									$ (3,802)
Cost of sales									(3,294)
Selling, general and administrative expenses									8
Provision for income taxes									(133)
Net income									$ (383)
Earnings per share:
Basic (in dollars per share)									$ (0.03)
Diluted (in dollars per share)									$ (0.03)

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