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Stockholders' Equity Note	3 Months Ended
	Mar. 31, 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 307,314 for the three months ended March 31, 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 three months ended March 31, 2017, the Company repurchased 228,831 shares of its common stock at a cost of $10.1 million. All shares repurchased under this program were retired, which resulted in a reduction of $2.4 million in paid-in capital and a reduction of $7.7 million in retained earnings.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

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