Fair Value Measurements (Schedule Of Fair Value Carried At Cost And Measured On A Nonrecurring Basis) (Details) - Nonrecurring [Member] - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable		$ 247,617	$ 181,916
Subordinated debt		20,258	22,132
Financial liabilities total		267,875	204,048
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable		247,617	181,916
Subordinated debt		20,258	22,132
Financial liabilities total		267,875	204,048
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	[1]	243,344	177,942
Subordinated debt	[1]	30,796	31,276
Financial liabilities total	[1]	$ 274,140	$ 209,218

[1] These balances are presented before any deduction for deferred financing costs.