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Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Weichai Transactions See Note 3. Weichai Transactions for information regarding transactions with Weichai. Transactions with Joint Ventures Doosan-PSI, LLC In 2015, the Company and Doosan Infracore Co., Ltd. (“Doosan”), a subsidiary of Doosan Group, entered into an agreement to form Doosan-PSI, LLC. The Company invested $1.0 million to acquire 50% of the venture, which was formed to operate in the field of developing, designing, testing, manufacturing, assembling, branding, marketing, selling, distributing and providing support for industrial gas engines and all components and materials required for assembly of the gas engines to the global power generation market outside of North America and South Korea. In the fourth quarter of 2019, Doosan and the Company agreed to wind down and dissolve the joint venture. This is expected to be completed in the second quarter of 2020. Joint Venture Operating Results The Company’s Consolidated Statements of Operations included income from this investment of $0.1 million for each of the three month periods ended March 31, 2019 and March 31, 2018. The joint venture operating results are presented in Other income, net in the Company’s Consolidated Statements of Operations.