Stock Incentive Plans (Details Textuals) (USD $)	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Stock Incentive Plans [Line Items]
Period of US Treasury Notes	7 years
Aggregate intrinsic value of options exercised under stock incentive plans	$ 1,686,000	$ 550,000
Cash received from option exercises under stock incentive plans	4,401,000
2005 Stock Incentive Plan [Member]
Stock Incentive Plans [Line Items]
Number of common stock authorized for Long-Term Incentive Plan	6,200,000
Stock Options [Member]
Stock Incentive Plans [Line Items]
Unrecognized compensation cost related to unvested stock options granted stock under our stock incentive plans	4,701,000
Expected recognized period	4
Restricted Stock [Member]
Stock Incentive Plans [Line Items]
Unrecognized compensation cost related to unvested stock options granted stock under our stock incentive plans	$ 16,084,000
Expected recognized period	3
Employee Stock Option [Member]
Stock Incentive Plans [Line Items]
Vesting period	10 years
Stock Option Restricted Stock Deferred Stock Units And Dividend Equivalent Rights [Member]
Stock Incentive Plans [Line Items]
Vesting period	10 years
Stock Option Restricted Stock Deferred Stock Units And Dividend Equivalent Rights [Member] \| Director [Member]
Stock Incentive Plans [Line Items]
Vesting period	3 years
Stock Option Restricted Stock Deferred Stock Units And Dividend Equivalent Rights [Member] \| Officer [Member]
Stock Incentive Plans [Line Items]
Vesting period	5 years

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Stock Incentive Plans.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock options and conversion of similar instruments granted under share-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i

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- Definition

As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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The weighted average period over which unrecognized share-based compensation costs are expected to be reported.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph h

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a

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The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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