Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Expenses and Other Current Liabilities [Abstract]
Payroll and employee benefits	$ 50,929	$ 57,166
Taxes other than income taxes	69,061	75,017
Interest	133	156
Workers’ compensation	16,119	20,044
Asset retirement obligations	10,366	13,113
Other	10,559	18,018
Accrued expenses and other current liabilities	$ 157,167	$ 183,514