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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts $ 245 $ 228
Property and equipment, accumulated depreciation 59,217 48,223
Intangible assets, accumulated amortization $ 10,899 $ 4,019
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 50,000 50,000
Common stock, shares issued 32,262 31,852
Common stock, shares outstanding 32,262 31,852
Treasury stock, shares 2,436 2,436
Series A Preferred Stock [Member]
    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 2,000 2,000
Preferred stock, shares outstanding 0 0
Series B Preferred Stock [Member]
    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 2,000 2,000
Preferred stock, shares outstanding 0 0