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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance For Doubtful Accounts [Member]
      
Balance at beginning of period $ 1,485 $ 2,013 $ 2,350
Charged to cost and expenses 3,415 191 710
Write-offs (1,506) (719) (1,047)
Balance at end of period 3,394 1,485 2,013
Valuation Allowance Of Deferred Tax Assets [Member]
      
Balance at beginning of period 78,211 74,940 83,120
Charged to cost and expenses (2,842) 1,059 (8,371)
Write-offs (3,579) 2,212 191
Balance at end of period $ 71,790 $ 78,211 $ 74,940