Accounting Policies and Pronouncements (Allowance for Credit Losses Activity) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 200
Balance at end of period	200
MUD Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0
Current-period provision for expected credit losses	0
Write-offs	0
Recoveries	0
Balance at end of period	0
SID Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0
Current-period provision for expected credit losses	0
Write-offs	0
Recoveries	0
Balance at end of period	0
TIF Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0
Current-period provision for expected credit losses	0
Write-offs	0
Recoveries	0
Balance at end of period	0
Net Investments in Lease Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	17
Current-period provision for expected credit losses	0
Write-offs	0
Recoveries	0
Balance at end of period	17
Notes Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	209
Current-period provision for expected credit losses	(32)
Write-offs	(1)
Recoveries	0
Balance at end of period	176
Trade accounts receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0
Current-period provision for expected credit losses	109
Write-offs	(44)
Recoveries	0
Balance at end of period	$ 65