Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Statement of Financial Position [Abstract]      
Accounts receivable, allowance $ 13,292 $ 18,824 $ 13,426
Preferred stock, par value (usd per share) $ 0.01 $ 0.01 $ 0.01
Preferred stock, authorized shares (shares) 25,000,000 25,000,000 25,000,000
Preferred stock, issued shares (shares) 0 0 0
Common stock, par value (usd per share) $ 0.01 $ 0.01 $ 0.01
Common stock, authorized shares (shares) 300,000,000 300,000,000 300,000,000
Common stock, issued shares (shares) 52,390,584 52,425,895 52,350,784