Commitments and Contingencies (Purchase Commitments) (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) agreement property real_estate_investment_trust	Dec. 31, 2014 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Escrow deposits	$ 5,835	$ 34,339
Purchase Commitment [Member] | Private Capital Management Segment [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of Managed REITs to be assigned | real_estate_investment_trust	1
Number of purchase and sale agreements | agreement	26
Percentage of voting interests acquired	100.00%
Number of properties acquired | property	33
Aggregate purchase price	$ 417,000
Escrow deposits	$ 5,900