Loans Receivable and Other Lending Investments, net (Maturities) (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Amortized Cost Basis
Within one year	$ 20,184
After one year through 5 years	78,306
After 5 years through 10 years	0
After 10 years	0
Amortized Cost Basis	98,490
Estimated Fair Value
Within one year	20,434
After one year through 5 years	79,696
After 5 years through 10 years	0
After 10 years	0
Total	100,130
Amortized Cost Basis
Within one year	0
After one year through 5 years	0
After 5 years through 10 years	0
After 10 years	21,185
Amortized Cost Basis	21,185
Estimated Fair Value
Within one year	0
After one year through 5 years	0
After 5 years through 10 years	0
After 10 years	21,282
Total	$ 21,282