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Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2005
Goodwill and Intangible Assets
Goodwill	$ 40,969,000	$ 40,969,000	$ 40,969,000
Estimated amortization of the contractual agreements
Weighting of both income and market approaches for determining the fair value of goodwill (as a percent)		50.00%	50.00%
Discount rate used to estimate fair value of goodwill (as a percent)		14.60%	13.40%
CALLC
Other Intangible Assets
Fair market value of contractual agreements acquired in connection with the acquisition				1,300,000
Accumulated amortization related to contractual agreements	1,000,000
Amortization expense related to contractual agreements	33,000	33,000	33,000
Estimated amortization of the contractual agreements
2012	28,000
2013	27,000
2014	27,000
2015	27,000
2016	27,000
Thereafter	175,000
Total	$ 311,000

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