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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 8,389 $ 8,657
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000 100,000
Common stock, shares issued 48,167 47,136
Common stock, shares outstanding 45,492 44,716
Treasury stock, shares 2,676 2,420