SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and qualifying accounts
Balance at beginning of period	$ 2,404	$ 3,212	$ 2,339
(Recovered) charged to costs and expenses	619	32	2,180
Deductions		(840)	(1,307)
Balance at end of period	3,023	2,404	3,212
Loan loss reserves
Valuation and qualifying accounts
Balance at beginning of period	1,673	1,671	782
(Recovered) charged to costs and expenses	517	2	1,274
Deductions			(385)
Balance at end of period	2,190	1,673	1,671
Straight-line rent receivable allowance
Valuation and qualifying accounts
Balance at beginning of period	731	1,541	1,557
(Recovered) charged to costs and expenses	102	30	906
Deductions		(840)	(922)
Balance at end of period	$ 833	$ 731	$ 1,541