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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
	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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No definition available.

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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

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