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Stockholders' Equity (Notes)	9 Months Ended
	Sep. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]
Treasury Stock [Text Block]	8. Stockholders' Equity There were 0.2 million and 0.5 million shares issued during the three and nine months ended September 30, 2017, respectively, for vesting of restricted stock units, exercise of stock options and stock purchases under the Employee Stock Purchase Plan. 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 and nine months ended September 30, 2017, the Company repurchased 1.0 million and 1.2 million shares of its common stock at a cost of $47.9 million and $58.0 million, respectively. All shares repurchased were retired, resulting in a reduction of $10.8 million and $13.2 million in paid-in capital and a reduction of $37.1 million and $44.8 million in retained earnings, during the three and nine months ended September 30, 2017, respectively.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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