(Changes in Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Real estate investments, at cost (including assets held for sale):
Balance at beginning of year	$ 1,729,983		$ 1,414,959	$ 322,205
Additions-Acquisitions	0		301,858	1,082,292
Capital expenditures	27,231		15,356	12,089
Disposals	(42,494)		(2,190)	(1,627)
Balance at end of the year	1,714,720		1,729,983	1,414,959
Accumulated depreciation (including assets held for sale):
Balance at beginning of year	93,012		31,715	9,476
Depreciation expense	61,527		63,349	23,405
Disposals	(15,127)		(2,052)	(1,166)
Balance at end of the year	$ 139,412	[1],[2]	$ 93,012	$ 31,715

[1] The accumulated depreciation column excludes $36.2 million of amortization associated with acquired intangible lease assets.

[2] The tax basis of aggregate land, buildings and improvements as of December 31, 2015 is $1.7 billion