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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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