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Stockholders' Equity Note
6 Months Ended
Jun. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Treasury Stock [Text Block]
7. Stockholders' Equity 

The number of shares issued upon vesting of restricted stock units, exercise of stock options and stock purchases under the Employee Stock Purchase Plan was 45,696 and 353,010 for the three and six months ended June 30, 2017, respectively.

On June 10, 2016, the Board of Directors approved a stock repurchase program, whereby the Company may repurchase up to $150.0 million of its common stock over the following two years. During the six months ended June 30, 2017, the Company repurchased 228,831 shares of its common stock at a cost of $10.1 million. All shares repurchased were retired, resulting in a reduction of $2.4 million in paid-in capital and a reduction of $7.7 million in retained earnings.