Schedule III - Real Estate and Accumulated Depreciation Reconciliation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of the year	$ 4,550,937
Acquistion and development of rental properties during the year	1,257,263
Disposition of rental properties during the year	(171,314)
Balance at close of year	5,636,886
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of the year	635,535
Depreciation during the year	132,578
Disposition of rental properties during the year	(26,779)
Balance at close of year	$ 741,334