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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-Sale Securities
Amortized Cost Basis	$ 21,185
Estimated Fair Value	21,282
Held-to-Maturity Securities
Amortized Cost Basis	98,490
Estimated Fair Value	100,130
Investments, Debt and Equity Securities [Abstract]
Face Value	141,380	$ 87,848
Amortized Cost Basis	119,675	87,964
Net Unrealized Gain	1,737	3,193
Estimated Fair Value	121,412	91,157
Net Carrying Value	119,772	89,576
Municipal debt securities
Available-for-Sale Securities
Face Value	21,185	21,230
Amortized Cost Basis	21,185	21,230
Net Unrealized Gain	97	1,612
Estimated Fair Value	21,282	22,842
Net Carrying Value	21,282	22,842
Debt securities
Held-to-Maturity Securities
Face Value	120,195	66,618
Amortized Cost Basis	98,490	66,734
Net Unrealized Gain	1,640	1,581
Estimated Fair Value	100,130	68,315
Net Carrying Value	$ 98,490	$ 66,734

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