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Summary Of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Line Items]
Recoveries	$ (9)	$ 0
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, quarter ended	$ 231	$ 203	$ 240	$ 203

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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