SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Allowance for Credit Losses on Financing Receivables) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
MUD Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 0
Current-period provision for expected credit losses	0
Write-offs	0
Balance at end of year	0
SID Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0
Current-period provision for expected credit losses	0
Write-offs	0
Balance at end of year	0
TIF Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0
Current-period provision for expected credit losses	0
Write-offs	0
Balance at end of year	0
Net Investments in Lease Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	17
Current-period provision for expected credit losses	0
Write-offs	0
Balance at end of year	17
Notes Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	209
Current-period provision for expected credit losses	(52)
Write-offs	(1)
Balance at end of year	156
Trade Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0
Current-period provision for expected credit losses	99
Write-offs	(59)
Balance at end of year	$ 40