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Summary of Significant Accounting Policies and Other Information - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | $ 416,616 | $ 339,465 | $ 362,387 | $ 347,580
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | 355,268 | 304,621 | 327,479 | 323,474
Pacific Rim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | 42,221 | 22,827 | 25,356 | 17,719
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | 14,205 | 11,065 | 9,552 | 5,705
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | 4,922 | 952 | 0 | 682
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | 190,724 | 164,245 | 174,203 | 155,935
Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | 159,008 | 115,367 | 137,190 | 191,528
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue recognized under year-end delivery incentives | $ 66,884 | $ 59,853 | $ 50,994 | $ 117

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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