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Stockholders' Equity (Notes)	3 Months Ended
	Mar. 31, 2018
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity	8. Stockholders' Equity There were 129,514 shares issued upon the vesting of restricted stock units, exercise of stock options and stock purchases under the Employee Stock Purchase Plan during the three months ended March 31, 2018. The accumulated other comprehensive loss balance at March 31, 2018 and December 31, 2017, and other comprehensive income during the three months ended March 31, 2018, consists of foreign currency translation adjustments.

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No definition available.

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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.

+ References

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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