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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-Sale Securities
Amortized Cost Basis	$ 21,195
Estimated Fair Value	21,835
Held-to-Maturity Securities
Amortized Cost Basis	18,878
Estimated Fair Value	19,281
Investments, Debt and Equity Securities [Abstract]
Face Value	40,098	$ 87,848
Amortized Cost Basis	40,073	87,964
Net Unrealized Gain (Loss)	1,043	3,193
Estimated Fair Value	41,116	91,157
Net Carrying Value	40,713	89,576
Municipal debt securities
Available-for-Sale Securities
Face Value	21,195	21,230
Amortized Cost Basis	21,195	21,230
Net Unrealized Gain (Loss)	640	1,612
Estimated Fair Value	21,835	22,842
Net Carrying Value	21,835	22,842
Debt securities
Held-to-Maturity Securities
Face Value	18,903	66,618
Amortized Cost Basis	18,878	66,734
Net Unrealized Gain (Loss)	403	1,581
Estimated Fair Value	19,281	68,315
Net Carrying Value	$ 18,878	$ 66,734

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