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CONSOLIDATED BALANCE SHEETS (parenthetical items) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current $ 38,550 $ 23,909
Accumulated depreciation 352,586 312,106
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 74,222 87,142
5.375% Senior Notes due 2021    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ 1,039