Number of stock appreciation rights exercised during the current period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of stock appreciation rights outstanding and currently exercisable under the plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock appreciation rights outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of stock appreciation rights outstanding and currently exercisable under the stock appreciation rights plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of stock appreciation rights outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on SARs which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which holders acquired rights under the SARs plan during the reporting period.

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- Definition

For presentations that combine terminations, the number of stock appreciation rights that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the SARs plan or that expired.

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The weighted average price at which grantees could have acquired the underlying rights with respect to stock appreciation rights that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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Net number of stock appreciation rights granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the rights reserved for issuance under the SARs plan during the reporting period.

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The total dollar difference between fair values of the underlying rights reserved for issuance and exercise prices pertaining to SARs outstanding under the plan as of the balance sheet date.

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he number of stock appreciation rights reserved for issuance under SARs agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested rights.

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The number of stock appreciation rights reserved for issuance under SARs agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested rights.

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The weighted average price as of the ending of the year at which grantees can acquire the rights reserved for issuance under the SARs plan.

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The weighted average price as of the beginning of the year at which grantees can acquire the rights reserved for issuance under the SARs plan.

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The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

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The weighted average fair value at remeasurement date for nonvested equity-based awards outstanding 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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The weighted average fair value at grant date for nonvested equity-based awards outstanding 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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The estimated maximum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated minimum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The maximum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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- Definition

The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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

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

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

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

+ References

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

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General descriptive information regarding an arrangement under which employees and directors receive (a) awards of equity shares, equity share options, or other equity instruments or (b) the entity incurs liabilities to them (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

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- Definition

The weighted average fair value as of the grant date of share-based award plans other than stock option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of 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

-Subparagraph b(2)(e)

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- Definition

The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

+ 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)(c)

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- Definition

The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

+ 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)(c)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

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- Definition

The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock 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.

+ 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)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(b)

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock 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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph b(2)(a)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(b)

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The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ 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)(d)

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- Definition

The total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(2)

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

+ 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)(d)

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph e(2)(c)

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph e(2)(a)

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph e(2)(b)

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph e(2)(d)

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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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The number of shares into which fully or partially vested stock options outstanding as of the balance-sheet date can be currently converted under the option plan.

+ 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(1)(c), d(2)

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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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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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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The quantity of shares issuable on stock options awarded under the plan during the reporting period.

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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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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options that are exercisable.

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As of the balance sheet date, the number of shares for which fully vested and expected to vest stock options can be exercised under the option plan.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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The weighted-average period between the balance-sheet date and expiration date for fully vested and expected to vest options that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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-Name Statement of Financial Accounting Standard (FAS)

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The weighted-average period between the balance-sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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Number of shares issued during the period as a result of the exercise of stock options.

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Regulation S-X (SX)

-Number 210

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SHARE BASED COMPENSATION (DETAILS) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
SHARE BASED COMPENSATION (DETAILS) (USD $)	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense		$ 4,438,000	$ 7,946,000	$ 20,445,000	$ 13,003,000
Share Based Compensation Employee Stock Purchase Plan Activity Abstract
Stock Options Outstanding Weighted Average Exercise Price Beginning of Period				$ 30.01
Stock Options Granted Weighted Average Exercise Price	$ 34.30	$ 34.30		$ 34.30
Stock Options Exercised Weighted Average Exercise Price	$ 27.69	$ 27.69		$ 27.69
Stock Options Cancelled Weighted Average Exercise Price	$ 36.82	$ 36.82		$ 36.82
Stock Options Outstanding Weighted Average Exercise Price End of Period	$ 31.31	$ 31.31		$ 31.31
Stock Options Outstanding Number Beginning Balance				6,491,353
Stock Options Granted Shares				79,933
Stock Options Exercised Shares				(2,385,326)
Stock Options Cancelled Shares				(80,705)
Stock Options Outstanding Number Ending Balance	4,105,255	4,105,255		4,105,255
Stock Options Outstanding Remaining Contractual Term	2.7	2.7		2.7
Stock Options Outstanding Aggregate Intrinsic Value	24,374,272	24,374,272		24,374,272
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan Description				Stock option awards are granted at the fair market value on the date of grant. The option awards vest over a period determined at the time the options are granted, ranging from one to five years, and generally have a maximum term of ten years. Certain options provide for accelerated vesting if there is a change in control (as defined in the plans). When options are exercised, new shares of the Company’s Class A common stock are issued.
Compensation Cost Not Yet Recognized	1,200,000	1,200,000		1,200,000
Compensation Cost Recognition Period				2.5
Share Based Compensation Expense		187,000	307,000	670,000	1,145,000
Share Based Compensation Employee Stock Purchase Plan Activity Abstract
Total Intrinsic Value Of Options Excercised				20,534,415
Options Excercisable Shares	3,951,443	3,951,443		3,951,443
Options Excercisable Weighted Average Exercise Price	$ 31.51	$ 31.51		$ 31.51
Options Exercisable Weighted Average Remaining Contractual Term				2.5
Options Excercisable Aggregate Intrinsic Value	22,784,758	22,784,758		22,784,758
Options Outstanding Vested And Expected To Vest Shares	3,843,409	3,843,409		3,843,409
Options Outstanding Vested And Expected To Vest Weighted Average Exercise Price	$ 31.54	$ 31.54		$ 31.54
Options Outstanding Vested And expected To Vest Aggregate Intrinsic Value	21,951,973	21,951,973		21,951,973
Options Outstanding Vested And Expected To Vest Weighted Average Remaining Contractual Term				2.7
Options Exercisable Vested And Expected To Vest Shares	3,730,281	3,730,281		3,730,281
Options Exercisable Vested And Expected To Vest Weighted Average Exercise Price	$ 31.64	$ 31.64		$ 31.64
Options Exercisable Vested And Expected To Vest Weighted Average Remaining Contractual Term				2.5
Options Exercisable Vested And Expected To Vest Aggregate Intrinsic Value	21,021,472	21,021,472		21,021,472
Share Based Payment Award Fair Value Assumptions And Methodology Abstract
Fair Value Assumptions Expected Volatility Rate				0.33%	0.33%
Fair Value Assumptions Expected Life				7.0	7.0
Fair Value Assumptions Risk Free Interest Rate Minimum				2.47%	2.82%
Fair Value Assumptions Risk Free Interest Rate Maximum				2.81%	3.04%
Fair Value Assumptions Risk Expected Dividend Yield Minimum				0.77%	1.02%
Fair Value Assumptions Risk Expected Dividend Yield Maximum				0.88%	1.06%
Grant Date Fair Value Of Options				$ 12.25	$ 8.28
Restricted Stock Units RSU [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation Cost Not Yet Recognized	34,800,000	34,800,000		34,800,000
Compensation Cost Recognition Period				3.2
Share Based Compensation Expense		2,794,000	2,401,000	8,593,000	5,577,000
Share Based Compensation Equity Instruments Other Than Options Plan Activity Abstract
Restricted Stock Nonvested Number Beginning Balance				1,794,445
Restricted Stock Granted Shares				758,457
Units Vested				(485,030)
Forfeited Units				(29,619)
Restricted Stock Nonvested Number Ending Balance	2,038,253	2,038,253		2,038,253
Restricted Stock Nonvested Weighted Average Grant Date Fair Value Beginning of Period				$ 17.94
Restricted Stock Granted Weighted Average Grant Date Fair Value				$ 31.48
Awards Vested Weighted Average Grant Date Fair Value				$ 19.19
Units Cancelled Weighted Average Grant Date Fair Value	$ 24.00	$ 24.00		$ 24.00
Restricted Stock Nonvested Weighted Average Grant Date Fair Value End of Period	$ 22.59	$ 22.59		$ 22.59
Fair Value Of Awards Vested				9,300,000	7,800,000
Stock Appreciation Rights SARS [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation Cost Not Yet Recognized	31,200,000	31,200,000		31,200,000
Compensation Cost Recognition Period				3.0
Share Based Compensation Expense		1,457,000	5,238,000	11,182,000	6,281,000
Share Based Payment Award Fair Value Assumptions And Methodology Abstract
Fair Value Assumptions Expected Volatility Rate	0.33%			0.32%
Fair Value Assumptions Expected Volatility Rate Minimum	0.96%				0.32%
Fair Value Assumptions Expected Volatility Rate Maximum	1.43%				0.33%
Fair Value Assumptions Expected Life				7.0	7.0
Fair Value Assumptions Expected Life Minimum	4.4
Fair Value Assumptions Expected Life Maximum	6.5
Fair Value Assumptions Risk Free Interest Rate				3.12%
Fair Value Assumptions Risk Free Interest Rate Minimum					2.06%
Fair Value Assumptions Risk Free Interest Rate Maximum					3.07%
Fair Value Assumptions Risk Expected Dividend Yield	0.88%			0.87%
Fair Value Assumptions Risk Expected Dividend Yield Minimum					0.89%
Fair Value Assumptions Risk Expected Dividend Yield Maximum					1.06%
Share Based Compensation Equity Instruments Other Than Options Plan Activity Abstract
Grant Date Fair Value of Stock Appreciation Rights				$ 9.90	$ 8.16
Remeasurement Date Fair Value Of Stock Appreciation Rights	$ 20.66
Share Based Compensation Stock Appreciation Rights Plan Activity Abstract
Stock Appreciation Rights Outstanding Weighted Average Exercise Price Beginning of Period						$ 16.99
Stock Appreciation Rights Granted Weighted Average Exercise Price	$ 27.56	$ 27.56		$ 27.56
Stock Appreciation Rights Exercised Weighted Average Exercise Price	$ 15.54	$ 15.54		$ 15.54
Stock Appreciation Rights Cancelled Weighted Average Exercise Price	$ 16.21	$ 16.21		$ 16.21
Stock Appreciation Rights Outstanding Weighted Average Exercise Price End of Period	$ 17.46	$ 17.46		$ 17.46
Stock Appreciation Rights Outstanding Number Beginning Balance						3,030,142
Stock Appreciation Rights Granted Number	64,135	64,135		64,135
Stock Appreciation Rights Exercised Number	(279,852)	(279,852)		(279,852)
Stock Appreciation Rights Cancelled Number	(191,284)	(191,284)		(191,284)
Stock Appreciation Rights Outstanding Number Ending Balance	2,623,141	2,623,141		2,623,141
Stock Appreciation Rights Outstanding Weighted Average Remaining Contractual Term				5.0
Stock Appreciation Rights Outstanding Aggregate Intrinsic Value	49,884,864	49,884,864		49,884,864
Total Intrinsic Value Of Stock Appreciation Rights Excercised				5,701,172
Stock Appreciation Rights Exercisable Number	88,268	88,268		88,268
Stock Appreciation Rights Exercisable Weighted Average Exercise Price	$ 17.35	$ 17.35		$ 17.35
Stock Appreciation Rights Exercisable Weighted Average Remaining Contractual Term				5.0
Stock Appreciation Rights Exercisable Aggregate Intrinsic Value	$ 1,688,693	$ 1,688,693		$ 1,688,693