Intangible Assets, Net (Summary Of Identifiable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets subject to amortization, Gross carrying amount	$ 14,198	$ 14,198	$ 14,198
Intangible assets subject to amortization, Accumulated amortization	(4,334)	(4,001)	(2,949)
Intangible assets subject to amortization, Net carrying amount	9,864	10,197	11,249
Intangible assets not subject to amortization	27,421	27,421	27,421
Intangible assets, net	$ 37,285	$ 37,618	$ 38,670