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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total current portion of debt $ 6,936 $ 20,943
Total long-term debt 139,500 124,801
Total debt 146,436 145,744
Letters of credit issued 49,400 47,200
Senior Credit Facility    
Debt Instrument [Line Items]    
Total long-term debt $ 129,500 $ 117,750
Weighted average interest rate on current portion of debt 5.48% 4.61%
Senior Credit Facility | Bridge Loan    
Debt Instrument [Line Items]    
Total current portion of debt $ 0 $ 7,500
Subordinated Debt    
Debt Instrument [Line Items]    
Total long-term debt 10,000 0
Note Payable—Verde | Verde    
Debt Instrument [Line Items]    
Total current portion of debt 6,936 13,443
Total long-term debt $ 0 $ 7,051