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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Condensed Consolidated Balance Sheet [Abstract]    
Allowance for doubtful accounts, Accounts receivable $ 39 $ 259
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 600,000,000 600,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 230,000,000 230,000,000
Common stock, shares issued 35,851,000 35,833,000
Treasury stock, shares at cost 7,564,000 7,019,000