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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Preferred stock, par $ 0.001 $ 0.001
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 31,037,915 30,977,293
Treasury shares, shares 9,880,058 9,897,995