Debt Carrying Value of Debt Instruments (Tables) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Jul. 31, 2016
Debt Instrument [Line Items]
Principal	$ 289,263	$ 284,340
Carrying Value	257,163	253,256
Fair Value	267,538	246,091
Bank loans
Debt Instrument [Line Items]
Principal	11,627	3,917
Carrying Value	10,757	3,917
Fair Value	13,887	3,829
Bank loans | PWSC Loan
Debt Instrument [Line Items]
Principal	1,877	3,917
Carrying Value	1,877	3,917
Fair Value	1,856	3,829
Bank loans | KWH Loan
Debt Instrument [Line Items]
Principal	9,750	0
Carrying Value	8,880	0
Fair Value	12,031	0
Notes payable
Debt Instrument [Line Items]
Principal	187,136	189,923
Carrying Value	195,841	199,316
Fair Value	203,086	192,239
Notes payable | Flower Note
Debt Instrument [Line Items]
Principal	7,447	7,768
Carrying Value	7,447	7,768
Fair Value	8,269	8,565
Notes payable | Net Lease Note
Debt Instrument [Line Items]
Principal	9,000	9,000
Carrying Value	9,000	9,000
Fair Value	9,449	9,409
Mortgage
Debt Instrument [Line Items]
Principal	170,689	173,155
Carrying Value	179,394	182,548
Fair Value	185,368	174,265	$ 191,700
Subordinated debt
Debt Instrument [Line Items]
Principal	90,500	90,500
Carrying Value	50,565	50,023
Fair Value	$ 50,565	$ 50,023