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Stockholders' Equity Note	9 Months Ended
	Sep. 30, 2016
Stockholders' Equity Attributable to Parent [Abstract]
Treasury Stock [Text Block]	9. 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 175,440 and 738,507 for the three and nine months ended September 30, 2016, 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 next two years. During the three and nine months ended September 30, 2016, the Company repurchased 510,411 and 607,911 shares of its common stock at a cost of $19.0 million and $22.6 million, respectively. All shares repurchased under this program were retired, which resulted in a reduction of $5.4 million and $6.4 million in paid-in capital and a reduction of $13.6 million and $16.2 million in retained earnings, for the three and nine months ended September 30, 2016, respectively. The accumulated other comprehensive loss balance at September 30, 2016 and December 31, 2015, and other comprehensive income during the nine months ended September 30, 2016, consists of foreign currency translation adjustments.

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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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