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Stockholders' Equity (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	26 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 2012 Repurchase Program	Sep. 30, 2014 2012 Repurchase Program	Sep. 30, 2014 2012 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 50,000,000
Payments for repurchase of common stock			17,052,000	0	19,600,000		40,600,000
Allocated share-based compensation expense	3,161,000	2,810,000	8,610,000	8,423,000
Treasury stock, shares acquired					721,101		1,605,746
Treasury stock, average cost per share					$ 27.23		$ 25.28
Treasury Stock in accrued liabilities	2,586,000
Stock repurchase program, remaining authorized repurchase amount					$ 9,400,000

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Treasury Stock in accrued liabilities

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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The cash outflow to reacquire common stock during the period.

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-Name Accounting Standards Codification

-Glossary Financing Activities

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Amount of a stock repurchase plan authorized by an entity's Board of Directors.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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