Annual report pursuant to Section 13 and 15(d)

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details)

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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for doubtful accounts, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts
     
VALUATION AND QUALIFYING ACCOUNTS      
Balance at the beginning of Period $ 9,738 $ 9,394 $ 8,672
Charged to Costs and Expenses 11,095 8,879 8,641
Net (Deductions) Recoveries (9,372) (8,535) (7,919)
Balance at the end of Period $ 11,461 $ 9,738 $ 9,394