Fair Value Measurements (Schedule Of Fair Value Carried At Cost And Measured On A Nonrecurring Basis) (Details) - Nonrecurring [Member] - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable		$ 121,684	$ 106,894
Subordinated debt		16,621	16,088
Financial liabilities total		138,305	122,982
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable		121,684	106,894
Subordinated debt		16,621	16,088
Financial liabilities total		138,305	122,982
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	[1]	122,272	106,588
Subordinated debt	[1]	27,913	27,913
Financial liabilities total	[1]	$ 150,185	$ 134,501

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