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Stockholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	23 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 2012 Repurchase Program	Jun. 30, 2014 2012 Repurchase Program	Jun. 30, 2014 2012 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 50,000,000
Payments for repurchase of common stock			4,069,000	0	4,100,000		25,000,000
Allocated share-based compensation expense	2,720,000	2,687,000	5,449,000	5,613,000
Treasury stock, shares acquired					145,737		1,030,382
Treasury stock, average cost per share					$ 27.92		$ 24.29
Stock repurchase program, remaining authorized repurchase amount					$ 25,000,000

X

- Definition

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

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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

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

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- Definition

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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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