SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and qualifying accounts
Balance at beginning of period	$ 3,235	$ 3,441	$ 3,023
(Recovered) charged to costs and expenses	86	(206)	457
Deductions			(39)
Balance at end of period	3,321	3,235	3,441
Loan loss reserves
Valuation and qualifying accounts
Balance at beginning of period	2,255	2,315	2,190
(Recovered) charged to costs and expenses	192	(60)	125
Balance at end of period	2,447	2,255	2,315
Other notes receivable allowance
Valuation and qualifying accounts
Balance at beginning of period	166	166
(Recovered) charged to costs and expenses	(38)		166
Balance at end of period	128	166	166
Straight-line rent receivable allowance
Valuation and qualifying accounts
Balance at beginning of period	814	960	833
(Recovered) charged to costs and expenses	(68)	(146)	166
Deductions			(39)
Balance at end of period	$ 746	$ 814	$ 960