Schedule III - Real Estate and Accumulated Depreciation Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of the year	$ 2,489,437
Acquistion and development of rental properties during the year	377,300
Disposition of rental properties during the year	(62,128)
Balance at close of year	2,804,609
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of the year	376,003
Depreciation during the year	49,547
Disposition of rental properties during the year	(15,907)
Balance at close of year	$ 409,643