Commitments and Contingencies - Summary of Commitments (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Commitments and Contingencies
Investment Commitment	$ 169,641
2016 Funding	27,355
Commitments funded	56,640
Remaining commitment	113,001
Real estate properties
Commitments and Contingencies
Investment Commitment	67,924
2016 Funding	20,884
Commitments funded	28,103
Remaining commitment	39,821
Accrued incentives and earn-out liabilities
Commitments and Contingencies
Investment Commitment	16,600
2016 Funding	1,130
Commitments funded	1,130
Remaining commitment	15,470
Lease incentives
Commitments and Contingencies
Investment Commitment	5,652
2016 Funding	1,591
Commitments funded	2,046
Remaining commitment	3,606
Mortgage loans
Commitments and Contingencies
Investment Commitment	51,490
2016 Funding	2,833
Commitments funded	4,126
Remaining commitment	47,364
Joint venture investments
Commitments and Contingencies
Investment Commitment	25,650
2016 Funding	481
Commitments funded	20,624
Remaining commitment	5,026
Notes receivable
Commitments and Contingencies
Investment Commitment	2,325
2016 Funding	436
Commitments funded	611
Remaining commitment	$ 1,714