Commitments and Contingencies Purchase Commitments (Details) (Purchase Commitment [Member], Private Capital Management, USD $)	6 Months Ended
	Jun. 30, 2014 property agreement
Purchase Commitment [Member] | Private Capital Management
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of purchase and sale agreements	70
Purchase commitment, percentage of voting interests acquired	100.00%
Number of properties acquired	416
Purchase commitment, aggregate purchase price	$ 1,500,000,000
Escrow deposit	$ 41,800,000