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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation and qualifying accounts [Roll forward] |  |  |
Net operating loss carryforwards valuation allowance | $ 329 | $ 71,782 |
Valuation allowance expense (benefit) from Tax Cuts and Jobs Act |  | (112,355) |
Federal and state |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Net operating loss carryforwards valuation allowance | (5,919) | 294,568 | $ 128,931
Tax credit valuation allowance | 49,800 | 49,500 |
Valuation allowance expense (benefit) from Tax Cuts and Jobs Act | 6,042 | (222,786) |
Federal |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Tax credit valuation allowance | 207 |  | 13,931
Allowance for Doubtful Accounts |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Balance at beginning of period | 23,112 | 27,044 | 26,470
Charged to costs and expenses | 17,597 | 25,370 | 30,632
Charged to other accounts | 7,153 | 555 | 2,680
Deductions | (23,109) | (29,857) | (32,738)
Balance at end of period | 24,753 | 23,112 | 27,044
Deferred Tax Valuation Allowance |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Balance at beginning of period | 336,087 | 264,305 | 121,602
Charged to costs and expenses | 330 | 71,782 | 142,862
Charged to other accounts | 0 | 0 | 0
Deductions | 0 | 0 | (159)
Balance at end of period | $ 336,417 | $ 336,087 | $ 264,305

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- Definition Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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