Commitments and Contingencies - Purchase Commitments Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) property agreement real_estate_investment_trust	Dec. 31, 2015 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Escrow deposits	$ 5,741	$ 1,190
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	8
Percentage of voting interests acquired	100.00%
Number of properties acquired | property	20
Aggregate purchase price	$ 489,100
Escrow deposits	$ 3,700