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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

X
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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