Annual report pursuant to Section 13 and 15(d)

Allowance for Doubtful Receivables (Allowance for Doubtful Receivables Rollforward) (Details)

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Allowance for Doubtful Receivables (Allowance for Doubtful Receivables Rollforward) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
AllowanceForDoubtfulAccountsReceivableRollforward      
Balance at beginning of year $ 5,796 $ 9,189 $ 7,060
ProvisionForDoubtfulAccounts 3,649 4,294 3,085
Charged to other accounts (2,261) (29) 1,670
Write-offs net of recoveries 3,969 7,658 2,626
Balance at end of year $ 3,215 $ 5,796 $ 9,189