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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 108,646 | $ 110,630 | $ 317,069 | $ 329,319
Revenue recognized over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,857 | 3,455 | 11,341 | 9,203
Revenue recognized at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 104,789 | 107,175 | 305,728 | 320,116
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 93,395 | 95,288 | 275,152 | 284,351
Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,816 | 1,928 | 6,555 | 6,789
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,437 | 2,564 | 10,755 | 9,353
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,327 | 4,457 | 14,128 | 14,605
Mexico |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,682 | 1,031 | 3,519 | 2,137
Middle East |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,317 | 4,602 | 4,382 | 9,958
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,672 | $ 760 | $ 2,578 | $ 2,126

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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