Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS    
Allowance for doubtful accounts $ 3,303 $ 3,673
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares, issued 0 0
Preferred stock, shares, outstanding 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 38,699,111 38,626,378
Common stock, shares outstanding 35,645,992 35,586,916
Treasury stock, shares at cost 3,053,119 3,039,462