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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of period | $ 41,207 | $ 44,376 | $ 43,757
Charged to Costs and Other Deductions | 17,529 | 3,024 | 2,544
Charged to Other Accounts | (51) | (226) | 86
Deductions | 3,097 | (5,967) | (2,011)
Balance at End of Period | 61,782 | 41,207 | 44,376
Inventory reserve |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of period | 27,854 | 28,934 | 26,537
Charged to Costs and Other Deductions | 11,808 |  | 5,897
Charged to Other Accounts |  | 14,688 |
Deductions | (4,614) | (15,768) | (3,500)
Balance at End of Period | 35,048 | 27,854 | 28,934
Valuation allowance on deferred tax assets |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of period | 1,917,390 | 1,869,490 | 1,807,728
Charged to Other Accounts | 862,611 | 47,900 | 61,762
Balance at End of Period | $ 2,780,001 | $ 1,917,390 | $ 1,869,490

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