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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 2,239 $ 2,703
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 54,361,980 54,361,980
Treasury stock, shares 10,941,944 11,307,589