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Foreign Operations (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
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, 2019
Dec. 31, 2018
Dec. 31, 2017
Foreign operations:                              
Total sales $ 56,122,000 $ 74,655,000 $ 81,247,000 $ 72,266,000 $ 73,162,000 $ 64,676,000 $ 68,601,000 $ 63,046,000 $ 39,065,000 $ 38,494,000 $ 47,368,000 $ 36,746,000 $ 284,290,000 $ 269,485,000 $ 161,673,000
Property, plant and equipment — net 79,206,000       80,657,000               79,206,000 80,657,000  
UNITED STATES                              
Foreign operations:                              
Total sales                         178,953,000 181,207,000 103,513,000
Property, plant and equipment — net 39,132,000       37,778,000               39,132,000 37,778,000  
MEXICO                              
Foreign operations:                              
Total sales                         79,761,000 74,029,000 52,496,000
Property, plant and equipment — net 31,865,000       34,155,000               31,865,000 34,155,000  
CANADA                              
Foreign operations:                              
Total sales                         16,988,000 12,494,000 5,664,000
Property, plant and equipment — net $ 8,209,000       $ 8,724,000               8,209,000 8,724,000  
Other Geographical Location [Member]                              
Foreign operations:                              
Total sales                         $ 8,588,000 $ 1,755,000 $ 0