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Consolidated Balance Sheets Parenthetical - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Trade receivables, allowances $ 1,734 $ 2,062
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 50,000,000 50,000,000
Preferred stock, outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 300,000,000 300,000,000
Common stock, issued 43,412,660 43,282,201
Treasury stock, shares 4,586,973 3,864,062