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Debt - Schedule of Debt (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total current portion of debt $ 0 $ 6,936,000
Total long-term debt 94,000,000 139,500,000
Subordinated Debt 0 10,000,000
Total debt $ 94,000,000 $ 146,436,000
Senior Credit Facility    
Debt Instrument [Line Items]    
Weighted average interest rate 5.47% 5.48%
Letters of credit issued $ 41,700,000 $ 49,400,000
Senior Credit Facility | Senior Credit Facility    
Debt Instrument [Line Items]    
Total long-term debt 94,000,000 129,500,000
Note Payable | Note Payable—Verde Notes    
Debt Instrument [Line Items]    
Total current portion of debt $ 0 $ 6,936,000