Segment Reporting (Schedule of Capital Additions and Acquisitions by Reportable Segments) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Capital additions and acquisitions by segment [Line Items]
Total capital additions and acquisitions	$ 146,880	$ 410,772
Operating Segments [Member] | Data Centers [Member]
Capital additions and acquisitions by segment [Line Items]
Total capital additions and acquisitions	116	257,663
Operating Segments [Member] | Healthcare [Member]
Capital additions and acquisitions by segment [Line Items]
Total capital additions and acquisitions	$ 146,764	$ 153,109