Segment Reporting (Schedule of Assets by Reportable Segments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets by segment [Line Items]
Total assets	$ 2,330,504	$ 2,337,654
Operating Segments [Member] | Data Centers [Member]
Assets by segment [Line Items]
Total assets	1,094,095	1,102,550
Operating Segments [Member] | Healthcare [Member]
Assets by segment [Line Items]
Total assets	1,185,575	1,190,087
All Other [Member]
Assets by segment [Line Items]
Total assets	$ 50,834	$ 45,017