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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS        
Accounts receivable, allowances (in dollars) $ 1,132 $ 1,305    
Property and equipment, accumulated depreciation (in dollars) 115,679 88,042    
Intangible assets, accumulated amortization (in dollars) $ 2,893 $ 2,558    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01    
Preferred stock, authorized shares 4,000,000 4,000,000    
Preferred stock, issued shares 0 0    
Preferred stock, outstanding shares 0 0    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01    
Common stock, authorized shares 100,000,000 100,000,000    
Common stock, issued shares 21,223,076 20,747,161    
Common stock, outstanding shares 21,223,076 20,747,161 20,405,000 20,007,000