Property And Equipment, Net (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	May 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property And Equipment, Net [Abstract]
Depreciation expense		$ 5,600,000	$ 5,300,000	$ 5,100,000
Expected rental income, during 2013		512,000
Expected rental income, during 2014		335,000
Expected rental income, during 2015		178,000
Expected rental income, during 2016		100,000
Expected rental income, thereafter		67,000
Rental income associated with third party tenants		586,000	1,200,000	1,400,000
Purchase price for land and building	2,600,000
Cash for land and building	1,700,000	9,102,000	12,278,000	4,930,000
Non cash contribution of property	$ 900,000