SEC Schedule III Rollforward of Real Estate Assets and Accumulated Depreciation (Tables)

12 Months Ended

Dec. 31, 2017

SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule of Real Estate Properties

The following is a reconciliation of real estate assets and accumulated depreciation:

	Year Ended December 31,
	2017		2016		2015
Real Estate
Balance at beginning of period	$	14,187,820	$	13,545,295	$	12,438,940
Additions during the period:
Land	21,298		30,805		281,048
Buildings & improvements	598,820		854,194		1,030,043
	14,807,938		14,430,294		13,750,031
Less: Assets sold, written-off and deconsolidated	51,643		242,474		204,736
Balance at end of period	$	14,756,295	$	14,187,820	$	13,545,295
Accumulated Depreciation
Balance at beginning of period	$	2,581,514	$	2,356,728	$	2,209,778
Additions charged to operating expenses	360,391		346,755		309,306
	2,941,905		2,703,483		2,519,084
Less: Accumulated depreciation on assets sold, written-off and deconsolidated	56,622		121,969		162,356
Balance at end of period	$	2,885,283	$	2,581,514	$	2,356,728