Schedule III - REAL ESTATE AND ACCUMLATED DEPRECIATION (Reconciliation of Real Estate and Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Real Estate
Balance at beginning of year	$ 4,116,556	$ 3,024,833	$ 2,746,596
Change in land	95,095	296,147	90,124
Additions	834,346	973,833	352,141
Dispositions and write-offs and land costs of sales	(271,365)	(178,257)	(164,028)
Balance at end of year	4,774,632	4,116,556	3,024,833
Reconciliation of Accumulated Depreciation
Balance at beginning of year	157,182	111,728	112,491
Depreciation expense	82,275	50,683	29,637
Dispositions and write-offs	(6,488)	(5,229)	(30,400)
Balance at end of year	$ 232,969	$ 157,182	$ 111,728
Building and Building Improvements | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	10 years
Building and Building Improvements | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	45 years
Equipment Tenant Improvements and Fixtures | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	5 years
Equipment Tenant Improvements and Fixtures | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	10 years
Computer, Hardware and Software and Vehicles | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	3 years
Computer, Hardware and Software and Vehicles | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	5 years