Stock Authorized to Repurchase.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Stockholders Equity.

+ Details

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Period Type:	duration

- Definition

Stock Repurchased And Retired During Period Average Price.

+ Details

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Data Type:	us-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 65

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares newly issued during the reporting period under the plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

+ Details

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- Definition

Value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Stockholders Equity (Details Textuals) (USD $)	1 Months Ended		6 Months Ended	12 Months Ended
Stockholders Equity (Details Textuals) (USD $)	Feb. 28, 2011	Feb. 28, 2010	Jun. 30, 2011	Dec. 31, 2010
Stockholders Equity (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Shares issued for Award	37,500
Stock Repurchase Authorized Value Under Program	$ 150,000,000	$ 100,000,000
Repurchase and Retiring Common shares			756,000	2,165,000
Repurchase and Retiring Common shares Average Price			$ 63.49	$ 46.16
Repurchase and Retiring Common shares, Value			$ (47,972,000)	$ (99,900,000)
2010 Performance Stock Criteria
Stockholders Equity (Textuals) [Abstract]
Maximum number of shares each recipient may receive under Performance Stock Award agreement		Between zero and up to 150% of the target number of shares
2011 Performance Stock Criteria \| Performance stock awards [Member]
Stockholders Equity (Textuals) [Abstract]
Maximum number of shares each recipient may receive under Performance Stock Award agreement	Between zero and up to 200% of the target number of shares