Schedule III - Real Estate and Accumulated Depreciation (Reconciliation of Real Estate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate, Beginning Balance	$ 2,956,761	$ 2,538,270	$ 1,849,939
Acquisitions	319,800	323,373	633,687
Capital Expenditures	105,074	101,131	59,090
Real Estate Write Off		(6,013)	(4,446)
Disposal of Assets	(350,496)
Real Estate, Ending Balance	3,031,139	2,956,761	2,538,270
Real Estate Accumulated Depreciation Beginning Balance	283,177	194,580	132,328
Accumulated Depreciation, Depreciation Expense	101,060	94,610	66,698
Accumulated Depreciation, Real Estate Write Off		(6,013)	(4,446)
Accumulated Depreciation, Disposal of Assets	(25,752)
Real Estate Accumulated Depreciation Ending Balance	358,485	$ 283,177	$ 194,580
Real Estate, Federal Income Tax Basis	$ 3,136,614