Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated useful lives for amortization) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated useful lives for amortization) (Details)
 6 Months Ended
Jun. 30, 2018
Trade name  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 30 years
Leasehold Intangibles | Lower Range  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 2 years
Leasehold Intangibles | Upper Range  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 26 years
Management contracts | Lower Range  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 2 years
Management contracts | Upper Range  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 26 years
Internally-developed software | Lower Range  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 5 years
Internally-developed software | Upper Range  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 10 years
Membership base  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 7 years