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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 2,491 $ 2,449
Property and equipment, accumulated depreciation 64,207 62,334
Intangible assets, accumulated amortization $ 13,235 $ 12,983
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 2,000 2,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 50,000 50,000
Common stock, shares issued 34,315 34,097
Common stock, shares outstanding 34,315 34,097
Treasury stock, shares 2,436 2,436