SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Debt Issuance Costs (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
|
Accounting Policies [Abstract] | ||||
Deferred debt issuance cost | $ 0.8 | |||
Unamortized debt issuance expense | $ 4.0 | $ 4.0 | $ 3.5 | |
Amortization of debt issuance costs | $ 0.2 | $ 0.4 | ||
Unamortized debt issuance cost amortization period | 4 years 7 months 6 days |