10. Commitments and Contingencies (Details) - Solar Module Collection and Recycling Liability - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Accrued solar module collection and recycling liability	$ 134,228	$ 134,442
Percentage increase in annualized inflation rate	1.00%
Estimated increase in solar module collection recycling liability from sensitivity analysis	$ 25,700
Percentage decrease in annualized inflation rate	1.00%
Estimated decrease in solar module collection recycling liability from sensitivity analysis	$ 21,700