Property Held For Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Activity of Property Held for Sale [Roll Forward]
Beginning balance	$ 37,529	$ 53,392
Acquisitions	2,617	2,673
Capitalized improvements	39	87
Dispositions	(12,203)	(14,852)
Valuation adjustments	(2,415)	(3,771)
Balance at year end	$ 25,567	$ 37,529