Net Investment In Direct Finance Leases (Components Of Net Investment In Direct Finance Leases) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Net Investment In Direct Finance Leases [Abstract]
Gross finance lease receivables	[1]	$ 418,453	$ 412,489
Unearned income	[2]	(133,653)	(135,976)
Net investment in direct finance leases		284,800	276,513
Unguaranteed residual value		34,800	34,400
Executory costs		0	0
Unamortized initial direct costs		$ 0	$ 0

[1] At the inception of the lease, the Company records the total minimum lease payments, executory costs, if any, and unguaranteed residual value as gross finance lease receivables. The gross finance lease receivables are reduced as customer payments are received. There was $34.8 million and $34.4 million unguaranteed residual value at March 31, 2018 and December 31, 2017, respectively, included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of March 31, 2018 and December 31, 2017.

[2] The difference between the gross finance lease receivables and the cost of the equipment or carrying amount at the lease inception is recorded as unearned income. Unearned income, together with initial direct costs, are amortized to income over the lease term so as to produce a constant periodic rate of return. There were no unamortized initial direct costs as of March 31, 2018 and December 31, 2017.