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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - Revenues - Location of facilities | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New York |  |  |
Concentration of Credit Risk |  |  |
Percentage of total revenues (as a percent) | 16.00% | 16.00% | 16.00%
Florida |  |  |
Concentration of Credit Risk |  |  |
Percentage of total revenues (as a percent) | 17.00% | 17.00% | 18.00%
California |  |  |
Concentration of Credit Risk |  |  |
Percentage of total revenues (as a percent) | 8.00% | 8.00% | 8.00%
Texas |  |  |
Concentration of Credit Risk |  |  |
Percentage of total revenues (as a percent) | 10.00% | 10.00% | 10.00%

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