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Schedule II-Valuation and Qualifying Accounts (in thousands) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 2,156 $ 85,161 $ 79,289
Charged to Costs   40 5,965
Charged to Other Accounts   (2,629)  
Deductions 77 (80,416) (93)
Balance at End of Period 2,233 2,156 85,161
Allowance for doubtful accounts
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 512 438 583
Charged to Costs   40 (52)
Charged to Other Accounts   34  
Deductions (44)   (93)
Balance at End of Period 468 512 438
Valuation allowance on net deferred tax assets
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 1,644 84,723 78,706
Charged to Costs     6,017
Charged to Other Accounts   (2,663)  
Deductions 121 (80,416)  
Balance at End of Period $ 1,765 $ 1,644 $ 84,723