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Debt - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]    
Letters of credit contingently liable for $ 23,652 $ 21,000
Surety bonds $ 2,461,519 $ 2,393,157
Debt Covenant Period, Period One [Member] | Third A&R Credit Agreement [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio 4.75  
Debt Covenant Period, Period Two [Member] | Third A&R Credit Agreement [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio 3.50  
Debt Covenant Period, Period Three [Member] [Member] | Third A&R Credit Agreement [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio 2.75  
Debt Covenant Period, Period Four [Member] [Member] | Third A&R Credit Agreement [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio 2.25  
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 9.70% 10.35%