Quarterly report pursuant to Section 13 or 15(d)

Long Term Debt - Additional Information (Details)

v3.19.1
Long Term Debt - Additional Information (Details)
Mar. 31, 2019
USD ($)
Long-term Debt Obligation  
Debt Instrument [Line Items]  
Letters of credit outstanding, amount $ 4,800,000
Lease Obligation  
Debt Instrument [Line Items]  
Letters of credit outstanding, amount 300,000
Labor And Performance Guarantees  
Debt Instrument [Line Items]  
Letters of credit outstanding, amount $ 2,500,000