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Schedule II- Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule II- Valuation and Qualifying Accounts VALUATION AND QUALIFYING ACCOUNTS
(in thousands)

Description
Balance at
Beginning of
Year
Provision (Benefit)
for
Doubtful
Accounts
Write-offs,
Net of
Recoveries
Balance at
End of Year
Allowance for doubtful accounts:
2019$32,694  21,898  (15,275) $39,317  
2018$30,600  6,527  (4,433) $32,694  
2017$54,742  (6,711) (17,431) $30,600  
Description
Balance at
Beginning of
Year
AdditionsDeductions
Balance at
End of Year
Deferred income tax asset valuation allowance:
2019$2,643,899  147,881  (32,349) $2,759,431  
2018$3,390,467  201,282  (947,850) $2,643,899  
2017$3,286,723  112,543  (8,799) $3,390,467