Organization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	May 01, 2018	Feb. 01, 2018	Jan. 31, 2018
Carbon California [Member]
Ownership percentage		53.92%	56.40%	17.81%
OIE Membership Acquisition [Member]
Business acquisition purchase price	$ 58,200
Prudential [Member] | Carbon California [Member]
Ownership percentage		46.08%