DEBT - Carrying Value of Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jul. 31, 2016
Debt Instrument [Line Items]
Principal	$ 285,164	$ 286,717
Carrying Value	242,532	258,529
Fair Value	250,969	266,642
Bank loans
Debt Instrument [Line Items]
Principal	9,500	10,062
Carrying Value	8,727	9,240
Fair Value	10,966	12,255
Bank loans | PWSC Loan
Debt Instrument [Line Items]
Principal	0	437
Carrying Value	0	437
Fair Value	0	435
Bank loans | KWH Loan
Debt Instrument [Line Items]
Principal	9,500	9,625
Carrying Value	8,727	8,803
Fair Value	10,966	11,820
Notes payable
Debt Instrument [Line Items]
Principal	185,164	186,155
Carrying Value	193,418	194,634
Fair Value	199,616	199,732
Notes payable | Flower Note
Debt Instrument [Line Items]
Principal	7,226	7,337
Carrying Value	7,226	7,337
Fair Value	7,890	8,071
Notes payable | Net Lease Note
Debt Instrument [Line Items]
Principal	9,000	9,000
Carrying Value	9,000	9,000
Fair Value	8,785	9,396
Mortgage
Debt Instrument [Line Items]
Principal	168,938	169,818
Carrying Value	177,192	178,297
Fair Value	182,941	182,265	$ 191,700
Subordinated debt
Debt Instrument [Line Items]
Principal	90,500	90,500
Carrying Value	40,387	54,655
Fair Value	$ 40,387	$ 54,655