Summary Of Significant Accounting Policies (Schedule Of Notes Receivable Due From Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Face Amount	$ 7,722	$ 7,387
Reserve	(648)	(639)
Carrying Amount	7,074	6,748
MIG III [Member]
Summary Of Significant Accounting Policies [Line Items]
Face Amount	3,071	3,729
Reserve	(378)	(373)
Carrying Amount	2,693	3,356
MIG IV [Member]
Summary Of Significant Accounting Policies [Line Items]
Face Amount	4,651	3,658
Reserve	(270)	(266)
Carrying Amount	$ 4,381	$ 3,392