Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Insurance (Details)

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Commitments and Contingencies - Insurance (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Commitment And Contingencies [Line Items]    
Insurance and other non-current liabilities $ 357,084 $ 404,560
Insurance Claims    
Commitment And Contingencies [Line Items]    
Gross amount accrued for insurance claims 268,700 272,900
Insurance and other non-current liabilities 200,800 210,100
Related insurance recoveries/receivables 35,800 56,500
Related insurance recoveries/receivables included in prepaid expenses and other current assets 400 300
Related insurance recoveries/receivables included in other assets net 35,400 $ 56,200
Atlantic Bridge Project Insurance Claim    
Commitment And Contingencies [Line Items]    
Related insurance recoveries/receivables $ 45,800