Fair Value Measurements (Schedule Of Fair Value Carried At Cost And Measured On A Nonrecurring Basis) (Details) - Nonrecurring [Member] - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable		$ 133,585	$ 106,894
Subordinated debt		17,695	16,088
Financial liabilities total		151,280	122,982
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable		133,585	106,894
Subordinated debt		17,695	16,088
Financial liabilities total		151,280	122,982
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	[1]	133,850	106,588
Subordinated debt	[1]	27,913	27,913
Financial liabilities total	[1]	$ 161,763	$ 134,501

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