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Foreign Operations (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign operations:
Total sales	$ 49,072,000	$ 41,336,000	$ 39,006,000	$ 45,468,000	$ 46,564,000	$ 48,049,000	$ 54,856,000	$ 49,599,000	$ 44,414,000	$ 43,591,000	$ 46,124,000	$ 41,075,000	$ 174,882,000	$ 199,068,000	$ 175,204,000
Property, plant and equipment — net	70,601,000				74,103,000								70,601,000	74,103,000
United States
Foreign operations:
Total sales													119,018,000	129,651,000	123,317,000
Property, plant and equipment — net	42,547,000				44,191,000								42,547,000	44,191,000
Mexico
Foreign operations:
Total sales													51,389,000	63,586,000	47,772,000
Property, plant and equipment — net	$ 28,054,000				$ 29,912,000								28,054,000	29,912,000
Canada
Foreign operations:
Total sales													4,475,000	5,831,000	4,115,000
CoreComposites de Mexico, S. de R.L. de C.V.
Foreign operations:
Sales													$ 49,708,000	$ 69,235,000	$ 61,313,000
Expenses as a percentage of revenues													22.00%	19.00%	22.00%

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