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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 283 $ 245
Property and equipment, accumulated depreciation 61,625 59,217
Intangible assets, accumulated amortization $ 10,508 $ 10,899
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 32,385,000 32,262,000
Common stock, shares outstanding 32,385,000 32,262,000
Treasury stock, shares 2,436,000 2,436,000