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Commitments, Guarantees, and Contingencies	12 Months Ended
Commitments, Guarantees, and Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Guarantees, and Contingencies	Commitments, Guarantees, and Contingencies As of December 31, 2019, we had outstanding letters of credit totaling $0.1 million, which expire in 2022. In addition, as of December 31, 2019, we had three outstanding performance bonds totaling $12.4 million primarily for contracts in our alternative fuels business.