Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost Basis	$ 21,185
Estimated Fair Value	21,661
Held-to-Maturity Securities, Debt Maturities [Abstract]
Amortized Cost Basis	100,465
Estimated Fair Value	100,472
Investments, Debt and Equity Securities [Abstract]
Face Value	142,051	$ 87,848
Amortized Cost Basis	121,650	87,964
Net Unrealized Gain (Loss)	483	3,193
Estimated Fair Value	122,133	91,157
Net Carrying Value	122,126	89,576
Municipal Bonds
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Face Value	21,185	21,230
Amortized Cost Basis	21,185	21,230
Net Unrealized Gain (Loss)	476	1,612
Estimated Fair Value	21,661	22,842
Net Carrying Value	21,661	22,842
Corporate Debt Securities
Held-to-Maturity Securities, Debt Maturities [Abstract]
Face Value	120,866	66,618
Amortized Cost Basis	100,465	66,734
Net Unrealized Gain	7	1,581
Estimated Fair Value	100,472	68,315
Net Carrying Value	$ 100,465	$ 66,734