Segment Reporting (Schedule of Assets by Reportable Segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets by segment [Line Items]
Total assets	$ 2,479,382	$ 2,382,440
Operating Segments [Member] | Data Centers [Member]
Assets by segment [Line Items]
Total assets	1,098,562	1,097,952
Operating Segments [Member] | Healthcare [Member]
Assets by segment [Line Items]
Total assets	1,223,286	1,124,928
All Other [Member]
Assets by segment [Line Items]
Total assets	$ 157,534	$ 159,560