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Organization (Details) - USD ($)
$ in Millions
12 Months Ended
May 01, 2018
Dec. 31, 2018
Feb. 01, 2018
Organization (Textual)      
Voting percentage   100.00%  
Carbon California [Member]      
Organization (Textual)      
Divestitures, description The voting and profits interests and Prudential Legacy Insurance Company of New Jersey and Prudential Insurance Company of America or its affiliates ("Prudential") owns 46.08% of the voting and profits interest in Carbon California.    
Voting percentage 53.92%    
Delaware Limited Liability Company [Member]      
Organization (Textual)      
Business acquisation purchase price   $ 58.1  
Maximum [Member] | Carbon California [Member]      
Organization (Textual)      
Voting percentage     56.41%
Minimum [Member] | Carbon California [Member]      
Organization (Textual)      
Voting percentage     17.81%