Commitments and Contingencies - Summary of Commitments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Commitments and Contingencies
Investment Commitment	$ 162,884
2017 Funding	18,239
Commitments funded	64,369
Remaining commitment	98,515
Real estate properties
Commitments and Contingencies
Investment Commitment	64,974
2017 Funding	7,799
Commitments funded	24,579
Remaining commitment	40,395
Accrued incentives and earn-out liabilities
Commitments and Contingencies
Investment Commitment	14,000
Remaining commitment	14,000
Lease incentives
Commitments and Contingencies
Investment Commitment	6,560
2017 Funding	1,623
Commitments funded	3,723
Remaining commitment	2,837
Mortgage loans
Commitments and Contingencies
Investment Commitment	51,000
2017 Funding	7,829
Commitments funded	13,167
Remaining commitment	37,833
Joint venture investments
Commitments and Contingencies
Investment Commitment	25,650
2017 Funding	988
Commitments funded	22,900
Remaining commitment	2,750
Notes receivable
Commitments and Contingencies
Investment Commitment	700
Remaining commitment	$ 700