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Research and Development Costs	3 Months Ended
	Mar. 31, 2018
Research and Development [Abstract]
Research and Development Costs	17. Research and Development Costs Expenditures for research and development are charged to expense as incurred and totaled $19.2 million and $22.1 million, respectively, for the three month periods ended March 31, 2018 and 2017. Research and development costs are reported as a component of engineering, design and development expenses in our unaudited condensed consolidated statements of operations.

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- Definition

The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 730
-URI http://asc.fasb.org/subtopic&trid=2197926

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