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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions Charged to Cost and Expenses $ (26,900) $ (300) $ (15,700)
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year [1] 47,269 51,501 59,113
Additions Charged to Cost and Expenses [1] 18,929 3,762 8,050
Additions Charged to Other Accounts— Acquisitions and Related Adjustments [1] 0 0 0
Deductions From Reserve [1] (6,918) (7,994) (15,662)
Balance at End of Year [1] 59,280 47,269 51,501
Allowance for other short-term receivables      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 6,144 0  
Additions Charged to Cost and Expenses 9,753 6,144  
Additions Charged to Other Accounts— Acquisitions and Related Adjustments 0 0  
Deductions From Reserve 0 0  
Balance at End of Year 15,897 6,144 0
Allowance for long-term receivables      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 198,957 182,872 171,340
Additions Charged to Cost and Expenses 3,557 16,161 13,099
Additions Charged to Other Accounts— Acquisitions and Related Adjustments 0 0 0
Deductions From Reserve (15) (76) (1,567)
Balance at End of Year 202,499 198,957 182,872
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year [2] 266,414 133,929 119,309
Additions Charged to Cost and Expenses [2] 50,327 145,010 32,157
Additions Charged to Other Accounts— Acquisitions and Related Adjustments [2] (529) 1,832 (7,551)
Deductions From Reserve [2] (28,425) (14,357) (9,986)
Balance at End of Year [2] $ 287,787 $ 266,414 $ 133,929
[1] Deductions from reserve represent accounts written off and recoveries related to trade accounts receivables.
[2] Deductions from reserve represent accounts written off and recoveries related to trade accounts receivables.