Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Statement of Financial Position [Abstract]      
Accounts receivable, allowance $ 17,378 $ 16,863 $ 15,470
Preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Preferred stock, authorized shares 25,000,000 25,000,000 25,000,000
Preferred stock, issued shares 0 0 0
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock, authorized shares 300,000,000 300,000,000 300,000,000
Common stock, issued shares 53,188,408 53,002,368 54,061,037