LONG-TERM DEBT - (Schedule of Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt maturities	$ 118,776	$ 98,683
Unsecured Debt | Senior Unsecured Floating Rate Notes, Due December 31, 2027
Debt Instrument [Line Items]
Total debt maturities	98,789	98,683
Deferred financing costs	1,211	1,317
Unsecured Debt | Convertible Senior Unsecured Fixed Rate Notes, Due April 19, 2026
Debt Instrument [Line Items]
Total debt maturities	19,987	$ 0
Deferred financing costs	$ 1,013