Quarterly Financial Information (Unaudited) (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
Interim Period
Net sales	$ 164,531	$ 167,094	$ 172,890	$ 122,454	$ 141,323	$ 131,492	$ 144,860	$ 118,702
Gross profit	30,601	31,303	33,063	22,192	28,175	27,917	27,928	21,241	$ 117,159	$ 105,261
Net (loss) income	$ (41,152)	$ 6,408	$ 5,434	$ (1,858)	$ 78	$ 4,500	$ 3,216	$ (2,433)	$ (31,168)	$ 5,361	[1]
Basic (loss) earnings per common share (usd per share)	$ (3.97)	$ 0.62	$ 0.52	$ (0.18)	$ 0.01	$ 0.44	$ 0.31	$ (0.24)	$ (3.01)	$ 0.52
Diluted (loss) earnings per common share (usd per share)	$ (3.97)	$ 0.61	$ 0.52	$ (0.18)	$ 0.01	$ 0.43	$ 0.31	$ (0.24)	$ (3.01)	$ 0.51
Previously Reported
Interim Period
Net sales		$ 167,094	$ 172,890	$ 122,454	$ 141,323	$ 131,492	$ 144,860	$ 118,702
Gross profit		29,602	32,514	22,028	27,899	26,365	27,736	21,252
Net (loss) income		$ 4,971	$ 4,940	$ (2,022)	$ 289	$ 3,222	$ 3,024	$ (2,422)		$ 4,113
Basic (loss) earnings per common share (usd per share)		$ 0.48	$ 0.48	$ (0.20)	$ 0.03	$ 0.31	$ 0.29	$ (0.23)		$ 0.40
Diluted (loss) earnings per common share (usd per share)		$ 0.47	$ 0.47	$ (0.20)	$ 0.03	$ 0.31	$ 0.29	$ (0.23)		$ 0.39

[1] The balances as of January 1, 2017 and the year ended December 31, 2017 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 6 to the Consolidated Financial Statements.