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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 2,437 | $ 2,339 | $ 4,564
Charged (credited) to costs and expenses | 812 | (56) | 1,564
Credited to other accounts | (280) | 154 |
(Deductions) Adjustments | (845) |  | (3,789)
Balance at end of period | 2,124 | 2,437 | 2,339
Tax valuation allowance |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance at beginning of period | 236,332 | 329,523 | 328,397
Charged (credited) to costs and expenses | (1,679) | 6,162 | (3,016)
Credited to other accounts |  |  | 4,142
(Deductions) Adjustments | (28,023) | (99,353) |
Balance at end of period | $ 206,630 | $ 236,332 | $ 329,523

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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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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