LONG-TERM DEBT - (Schedule of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt maturities	$ 98,401	$ 44,404
Senior unsecured fixed rate notes, due March 15, 2029, net of deferred financing costs of $1,599 and $0, respectively
Debt Instrument [Line Items]
Deferred financing costs	1,599	0
Senior unsecured floating rate notes, due December 31, 2027, net of deferred financing costs of $0 and $348, respectively
Debt Instrument [Line Items]
Deferred financing costs	0	348
Senior unsecured fixed rate notes, due December 31, 2022, net of deferred financing costs of $0 and $248, respectively
Debt Instrument [Line Items]
Deferred financing costs	0	248
Unsecured Debt | Senior unsecured fixed rate notes, due March 15, 2029, net of deferred financing costs of $1,599 and $0, respectively
Debt Instrument [Line Items]
Total debt maturities	98,401	0
Unsecured Debt | Senior unsecured floating rate notes, due December 31, 2027, net of deferred financing costs of $0 and $348, respectively
Debt Instrument [Line Items]
Total debt maturities	0	24,652
Unsecured Debt | Senior unsecured fixed rate notes, due December 31, 2022, net of deferred financing costs of $0 and $248, respectively
Debt Instrument [Line Items]
Total debt maturities	$ 0	$ 19,752