Debt - $105 Million Secured Mortgage Notes Assumed (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2011 USD ($) a	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 USD ($) a
Debt Instrument [Line Items]
Acres acquired | a	250,000	36,750	62,344
Carrying value of debt		$ 833,879	$ 751,555
Mortgage notes due 2017 at fixed interest rates of 4.35%
Debt Instrument [Line Items]
Noncash or part noncash acquisition, debt assumed	$ 105,000
Fixed interest rate	4.35%	4.35%	4.35%
Debt instrument term, years	7 years
Repayments of secured debt	$ 21,000	$ 10,500	$ 10,500
Carrying value of debt		42,638	$ 53,801
Outstanding principal		$ 42,000