SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and qualifying accounts
Balance at beginning of period	$ 3,023	$ 2,404	$ 3,212
(Recovered) charged to costs and expenses	457	619	32
Deductions	(39)		(840)
Balance at end of period	3,441	3,023	2,404
Loan loss reserves
Valuation and qualifying accounts
Balance at beginning of period	2,190	1,673	1,671
(Recovered) charged to costs and expenses	125	517	2
Balance at end of period	2,315	2,190	1,673
Other notes receivable allowance
Valuation and qualifying accounts
(Recovered) charged to costs and expenses	166
Balance at end of period	166
Straight-line rent receivable allowance
Valuation and qualifying accounts
Balance at beginning of period	833	731	1,541
(Recovered) charged to costs and expenses	166	102	30
Deductions	(39)		(840)
Balance at end of period	$ 960	$ 833	$ 731