Mortgage Note Payable (Schedule Of Aggregate Future Principal Payments On Mortgage Notes Payable) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Secured Debt	$ 265,118	$ 35,320
Long-term Debt	265,118
Mortgages [Member]
Debt Instrument [Line Items]
2013	74
2014	189
2015	13,767
2016	16,820
2017	164,968
Thereafter	69,300
Secured Debt	$ 265,118	$ 35,320

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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