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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Tax credits, valuation allowance | $ 46,200 |  | $ 32,100 |  |  |
Allowance For Doubtful Accounts [Member] |  |  |  |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |  |  |  |
Balance at Beginning of Period | 26,470 |  | 26,501 |  | $ 17,728 |
Acquisition of Emeritus | 0 |  | 0 |  | 11,087 |
Charged to costs and expenses | 30,632 |  | 25,132 |  | 20,509 |
Charged to other accounts | 2,680 |  | 2,135 |  | 771 |
Deductions | (32,738) |  | (27,298) |  | (23,594) |
Balance at End of Period | 27,044 |  | 26,470 |  | 26,501 |
Deferred Tax Valuation Allowance [Member] |  |  |  |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |  |  |  |
Balance at Beginning of Period | 121,602 |  | 9,213 |  | 72,366 |
Acquisition of Emeritus | 0 |  | 0 |  | 1,002 |
Charged to costs and expenses | 142,862 | [1] | 111,797 | [2] | 0 |
Charged to other accounts | 0 |  | 592 | [2] | 0 |
Deductions | (159) | [3] | 0 |  | (64,155) | [4]
Balance at End of Period | 264,305 |  | 121,602 |  | 9,213 |
State [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount |  |  |  |  | $ (64,155) |
Federal net operating losses [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 128,931 |  | 81,968 |  |  |
Federal credits [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ 13,931 |  | $ 30,421 |  |  |
[1] | Adjustment to valuation allowance for federal and state net operating losses and federal credits of $128,931 and $13,931, respectively.
[2] | Adjustment to valuation allowance for federal and state net operating losses and federal credits of $81,968 and $30,421, respectively.
[3] | Prior year adjustment related to state valuation allowance.
[4] | Adjustment to valuation allowance for federal and state net operating losses and federal credits of $(64,155).

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