Annual report pursuant to Section 13 and 15(d)

Contingencies - Narrative (Details)

v3.10.0.1
Contingencies - Narrative (Details)
 6 Months Ended 12 Months Ended
Jul. 29, 2016
defendant
Jul. 29, 2016
claim
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]          
Number of complaints (complaints) | claim   2      
Insurance proceeds     $ (231,000) $ 0 $ (5,718,000)
Uninsured cash amount     50,300,000    
Maximum          
Loss Contingencies [Line Items]          
Cash, FDIC insured amount     $ 250,000    
Judicial District Court for the Parish of Cameron          
Loss Contingencies [Line Items]          
Number of defendants (defendants) | defendant 26        
Judicial District Court for the Parish of Vermillion          
Loss Contingencies [Line Items]          
Number of defendants (defendants) | defendant 40