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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-Sale Securities
Amortized Cost Basis	$ 21,185
Estimated Fair Value	21,840
Held-to-Maturity Securities
Amortized Cost Basis	96,525
Estimated Fair Value	96,903
Investments, Debt and Equity Securities [Abstract]
Face Value	140,723	$ 87,848
Amortized Cost Basis	117,710	87,964
Net Unrealized Gain	1,033	3,193
Estimated Fair Value	118,743	91,157
Net Carrying Value	118,365	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	655	1,612
Estimated Fair Value	21,840	22,842
Net Carrying Value	21,840	22,842
Debt securities
Held-to-Maturity Securities
Face Value	119,538	66,618
Amortized Cost Basis	96,525	66,734
Net Unrealized Gain	378	1,581
Estimated Fair Value	96,903	68,315
Net Carrying Value	$ 96,525	$ 66,734

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