Quarterly Financial Information (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 141,323,000	$ 131,492,000	$ 144,860,000	$ 118,702,000	$ 106,566,000	$ 114,644,000	$ 135,994,000	$ 126,310,000	$ 431,818,000	$ 415,375,000	$ 537,214,000
Gross profit	27,899,000	26,365,000	27,736,000	21,252,000	18,779,000	19,803,000	27,813,000	23,960,000	103,252,000	90,356,000	133,653,000
Net income (loss)	$ 289,000	$ 3,222,000	$ 3,024,000	$ (2,422,000)	$ (40,851,000)	$ (5,982,000)	$ (91,996,000)	$ (2,832,000)	$ 4,113,000	$ (141,660,000)	$ (44,445,000)
Basic earnings (loss) per common share (usd per share)	$ 0.03	$ 0.31	$ 0.29	$ (0.23)	$ (3.97)	$ (0.58)	$ (8.96)	$ (0.28)	$ 0.40	$ (13.79)	$ (4.33)
Diluted earnings (loss) per common share (usd per share)	0.03	0.31	0.29	(0.23)	(3.97)	(0.58)	(8.96)	(0.28)	0.39	(13.79)	(4.33)
Dividends paid per common share (usd per share)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0.04	$ 0.04	$ 0.04	$ 0.00	$ 0.12	$ 0.16
Additional tax expense from foreign tax positions, related to tax and jobs act	$ 3,298,000								$ 3,298,000
Tax benefit adjustments related to tax cuts and jobs act	1,508,000								1,508,000
Goodwill impairment							$ 128,938,000		0	$ 61,142,000	$ 80,337,000
Pre-tax gain on sale of facility						$ 6,946,000
Accrued foreign withholding taxes, unremitted earnings of foreign subsidiaries	1,220,000				$ 7,932,000				1,220,000	7,932,000
Deferred tax asset valuation allowance	$ 23,696,000				$ 29,719,000				$ 23,696,000	$ 29,719,000