Selected Quarterly Financial Data (Unaudited) (Narratives) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 24, 2014	Mar. 31, 2015	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition
Gain on the sale of property				$ 2,197	$ 13,338	$ 659
Ishops
Business Acquisition
Gain on the sale of property	$ 14,600	$ 2,200	$ 12,400
Deferred gain on the sale of property	$ 2,200