BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Accounting Policies [Abstract]
General and administrative expense				$ 23,710	$ 35,135	$ 18,843	$ 14,463
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation		$ 3,382	$ 1,395		3,382	2,382	2,298
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets		316,328			316,328
Lease liabilities		$ 316,329			316,329
General and administrative expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation					$ 2,769	$ 1,900	$ 1,823
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives					3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives					15 years
Patient base | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization period					4 months
Patient base | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization period					8 months
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization period					1 year
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization period					7 years
Common stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares issued (in shares)	27,834				27,834
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets								$ 240,090
Lease liabilities								$ 241,453