Commitments and Contingencies Purchase Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 agreement property	Dec. 31, 2013
Unrecorded Unconditional Purchase Obligation [Line Items]
Escrow deposits	$ 34,339,000	$ 101,813,000	[1]
Purchase Commitment [Member] | Private Capital Management Segment [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of purchase and sale agreements	51
Percentage of voting interests acquired	100.00%
Number of properties acquired	192
Aggregate purchase price	1,000,000,000
Escrow deposits	29,800,000
Acquisition Related Expenses [Member] | Purchase Commitment [Member] | Private Capital Management Segment [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Forfeited escrow deposits	$ 400,000

[1] December 31, 2013 line items have been broken out since the previously filed presentation to conform with current presentation and provide detailed balances relating to derivative assets, prepaid expenses, and deferred costs.