Accounting for stock based compensation.

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- Definition

Aggregate fair value, Deferred in the plan

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- Definition

Closing price of Company's common stock.

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- Definition

Grant received by Director as phantom stock.

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- Definition

Number of shares received by Director.

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- Definition

Share based compensation, contractual term of option granted.

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- Definition

Share equivalent units, Deferred in the plan.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(a)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(b)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Accounting for Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended			6 Months Ended			3 Months Ended	6 Months Ended							6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Jun. 30, 2011 Phantom Stock and Restricted stock [Member]	Jun. 30, 2011 Phantom Stock and Restricted stock [Member]	Jun. 30, 2011 Phantom Stock and Restricted stock [Member] Plan 2000 [Member]	Feb. 23, 2011 Phantom Stock and Restricted stock [Member] Plan 2000 [Member]	Feb. 24, 2010 Phantom Stock and Restricted stock [Member] Plan 2000 [Member]	May 19, 2009 Phantom Stock and Restricted stock [Member] Plan 2000 [Member]	Feb. 25, 2009 Phantom Stock and Restricted stock [Member] Plan 2000 [Member]	Feb. 23, 2011 Phantom Stock and Restricted stock [Member] Plan 2009 [Member]	Jun. 30, 2011 Contractual term of option granted prior to 2005 [Member]	Jun. 30, 2011 Contractual term of option granted from 2005 through 2007 [Member]	Jun. 30, 2011 Contractual term of option granted from 2008 through 2011 [Member]	Jun. 30, 2011 Plan 2000 [Member]	Feb. 23, 2011 Plan 2000 [Member]	Feb. 24, 2010 Plan 2000 [Member]	May 19, 2009 Plan 2000 [Member]	Feb. 25, 2009 Plan 2000 [Member]	Jun. 30, 2011 Plan 2009 [Member]	Jun. 30, 2011 Employee Stock Option [Member]	Jun. 30, 2011 Restricted Stock Restricted Stock Units And Phantom Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unissued common stock reserved for grants																		127,250					2,897,129
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards	$ 79,500,000			$ 79,500,000																				$ 17,200,000	$ 62,300,000
Closing price of Company's common stock	$ 25.68			$ 25.68															$ 37.96	$ 33.90	$ 25.27	$ 18.18
Grant received by Director as phantom stock										140,000	140,000	180,706	130,000
Number of shares received by Director											4,130	7,151	7,151	3,688
Total shares of phantom stock	8,000	1,084,949							42,906
Shares vested at weighted-average grant date	(12,000)	(962,662)					2,384	22,560
Weighted-average grant date fair value, Vested	$ 33.49	$ 27.27					$ 25.27	$ 24.68
Phantom stock and restricted stock units unvested	2,243,578	2,247,578		2,243,578		2,125,291	52,596	52,596
Weighted-average grant date fair value, Vested	$ 33.02	$ 33.04		$ 33.02		$ 27.92	$ 31.67	$ 31.67
Contractual term of option granted															10 years	8 years	10 years
Accounting For Stock Based Compensation (Textuals) [Abstract]
Weighted Average Period in months				26
Weighted-average grant date fair value of stock options	$ 8.89		$ 10.07	$ 10.29	$ 8.54
Aggregate intrinsic value of options exercised	200,000		18,600,000	6,100,000	28,200,000
Share equivalent units, Deferred in the plan	22,318			22,318
Aggregate fair value, Deferred in the plan	$ 600,000			$ 600,000
Valuation method used to estimate the fair value of stock options				Black Scholes option pricing model