Segment Reporting (Schedule of Assets by Reportable Segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets by segment [Line Items]
Total assets	$ 2,372,648	$ 2,190,842
Operating Segments [Member] | Data Centers [Member]
Assets by segment [Line Items]
Total assets	1,112,047	1,130,131
Operating Segments [Member] | Healthcare [Member]
Assets by segment [Line Items]
Total assets	1,087,147	933,257
All Other [Member]
Assets by segment [Line Items]
Total assets	$ 173,454	$ 127,454