Loans Receivable and Other Lending Investments, net (Maturities of Company Securities) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Held-to-Maturity Securities, Amortized Cost Basis
Within one year	$ 20,859
After one year through 5 years	79,606
After 5 years through 10 years	0
After 10 years	0
Total	100,465
Held-to-Maturity Securities, Estimated Fair Value
Within one year	20,866
After one year through 5 years	79,606
After 5 years through 10 years	0
After 10 years	0
Total	100,472
Available-for-Sale Securities, 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
Total	21,185
Available-for-Sale Securities, Estimated Fair Value
Within one year	0
After one year through 5 years	0
After 5 years through 10 years	0
After 10 years	21,661
Total	$ 21,661