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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation and qualifying accounts [Roll forward] |  |  |
Change in valuation allowance | $ 71,782 |  |
Federal and state |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Change in valuation allowance |  | $ 128,931 | $ 81,968
Federal |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Change in valuation allowance |  | 13,931 | 30,421
Allowance for Doubtful Accounts: |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Balance at beginning of period | 27,044 | 26,470 | 26,501
Charged to costs and expenses | 25,370 | 30,632 | 25,132
Charged to other accounts | 555 | 2,680 | 2,135
Deductions | (29,857) | (32,738) | (27,298)
Balance at end of period | 23,112 | 27,044 | 26,470
Deferred Tax Valuation Allowance: |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Balance at beginning of period | 264,305 | 121,602 | 9,213
Charged to costs and expenses | 71,782 | 142,862 | 111,797
Charged to other accounts | 0 | 0 | 592
Deductions | 0 | (159) | 0
Balance at end of period | 336,087 | $ 264,305 | $ 121,602
Total decrease in valuation allowance due to Tax Act | Federal and state |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Change in valuation allowance | 294,568 |  |
Total decrease in valuation allowance due to Tax Act | Federal |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Change in valuation allowance | $ (222,786) |  |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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