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, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Allowances, beginning of year $ 781 $ 639 $ 17
Amounts charged to expense 3,138 1,350 865
Write-offs of uncollectible receivables (2,801) (1,208) (243)
Allowances, end of year $ 1,118 $ 781 $ 639