Commitments and Contingencies - Summary of Commitments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Commitments and Contingencies
Investment Commitment	$ 169,882
2016 Funding	11,834
Commitments funded	59,271
Remaining commitment	110,611
Real estate properties
Commitments and Contingencies
Investment Commitment	66,224
2016 Funding	3,501
Commitments funded	20,905
Remaining commitment	45,319
Accrued incentives and earn-out liabilities
Commitments and Contingencies
Investment Commitment	14,600
Remaining commitment	14,600
Lease incentives
Commitments and Contingencies
Investment Commitment	8,808
2016 Funding	3,035
Commitments funded	5,817
Remaining commitment	2,991
Mortgage loans
Commitments and Contingencies
Investment Commitment	51,000
2016 Funding	4,384
Commitments funded	9,722
Remaining commitment	41,278
Joint venture investments
Commitments and Contingencies
Investment Commitment	29,050
2016 Funding	914
Commitments funded	22,827
Remaining commitment	6,223
Notes receivable
Commitments and Contingencies
Investment Commitment	200
Remaining commitment	$ 200