Annual report pursuant to Section 13 and 15(d)

Summary Of Significant Accounting Policies (Schedule Of Allowance For Uncollectible Accounts) (Details)

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Summary Of Significant Accounting Policies (Schedule Of Allowance For Uncollectible Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]      
Allowances, beginning of year $ 639 $ 17 $ 1,338
Amounts charged to expense 1,350 865 (48)
Write-offs of uncollectible receivables (1,208) (243) (1,273)
Allowances, end of year $ 781 $ 639 $ 17