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Commitments and Contingencies Note Receivable Details (Details)
3 Months Ended 14 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Oct. 31, 2016
USD ($)
defendant
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]        
Other gain from continuing operations   $ 5,500,000    
Notes receivable, current $ 800,000      
Notes receivables, noncurrent 2,900,000      
Houston Police Department, Environmental Enforcement | Pending Litigation        
Other Commitments [Line Items]        
Number of defendants | defendant     2  
Estimate of possible loss       $ 250,000
Settlement agreement, plea bargain declined $ 15,000   $ 75,000