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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance (in dollars) $ 3,814 $ 4,419
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 74,531,598 73,808,200
Treasury stock, common shares 5,086,125 4,963,013