Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 87,234	$ 91,295	$ 90,446	$ 95,998	$ 108,454	$ 108,227	$ 103,808	$ 94,317	$ 364,973	$ 414,806	$ 384,626
Cost of sales	64,136	67,211	66,937	71,414	75,741	76,023	73,867	69,376	269,698	295,007	293,573
Gross profit	23,098	24,084	23,509	24,584	32,713	32,204	29,941	24,941
Operating income (loss)	(11,628)	(2,104)	(7,505)	(42,322)	6,064	222	2,120	(5,603)	(63,559)	2,803	(122,738)
Net income (loss)	$ (11,254)	$ 14,326	$ (14,142)	$ (19,698)	$ 7,400	$ (1,310)	$ 1,681	$ (6,051)	$ (30,768)	$ 1,720	$ (95,695)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.33)	$ 0.41	$ (0.40)	$ (0.55)	$ 0.21	$ (0.04)	$ 0.05	$ (0.17)	$ (0.87)	$ 0.05	$ (2.58)
Diluted (in dollars per share)	$ (0.33)	$ 0.41	$ (0.40)	$ (0.55)	$ 0.21	$ (0.04)	$ 0.05	$ (0.17)	$ (0.87)	$ 0.05	$ (2.58)