Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.19.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
Apr. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Standards Update 2016-18 [Member]      
Line of Credit Facility [Line Items]      
Restricted cash and cash equivalents revised amount   $ 6.1 $ 15.1
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Operating lease liabilities $ 13.5    
Right of use assets under operating leases $ 12.7