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, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]      
Allowances, beginning of year $ 17 $ 1,338 $ 1,304
Amounts charged to expense 865 (48) 285
Write-offs of uncollectible receivables (243) (1,273) (251)
Allowances, end of year 639 17 1,338
Notes receivable $ 20,742