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Represents the estimated percentage of forfeitures considered for reduction in stock compensation expense recognized during the period.

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The amount of tax deficiency associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP) that is deducted from additional paid in capital. A tax deficiency results from the deductible amount for an award of an equity instrument on the entity's tax return being less than the cumulative compensation cost recognized for financial reporting purposes. This element should not be used to report tax deficiencies that are charged to income tax expense.

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Adjustment to additional paid in capital related to the net effect of excess tax benefits and tax deficiencies associated with an equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

+ 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
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 00-15
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11374-113907

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-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.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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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).

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

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) 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.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph A240
-Subparagraph b(2)(c)
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-Subparagraph c(1)
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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)
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-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Number 123R
-Paragraph A240
-Subparagraph b(2)(a)
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-Paragraph A240
-Subparagraph b(2)(b)
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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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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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The estimated measure of the 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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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 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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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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Net number of share options (or share units) granted during the period.

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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 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 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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-SubTopic 10
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-Paragraph 2
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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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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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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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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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Number of share options (or share units) exercised during the current period.

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General (Details 7) (USD $)	3 Months Ended		6 Months Ended
General (Details 7) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share based compensation
Stock compensation expense	$ 4,205,000	$ 3,706,000	$ 8,983,000	$ 8,234,000
Estimated forfeitures (as a percent)	4.00%	5.00%	4.00%	5.00%
Benefits of tax deductions in excess of recognized stock compensation expenses			1,600,000	0
Change to additional paid in capital related to tax benefits (deficiencies)			1,400,000	(400,000)
Deficiency of tax deductions offset by tax benefits in recognized stock compensation expenses			$ (200,000)
Stock options
Stock options, nonvested restricted stock awards and nonvested restricted stock units
Weighted average grant date fair value of stock options granted (in dollar per share)			$ 12.96
Expected volatility (as a percent)			29.90%
Activity in company's stock options
Outstanding, beginning of the period (in shares)			3,775,586
Granted (in shares)			1,059,466
Forfeited (in shares)			(17,292)
Exercised (in shares)			(722,048)
Outstanding, end of the period (in shares)	4,095,712		4,095,712
Vested and expected to vest at the end of period (in shares)	3,984,049		3,984,049
Exercisable, end of period (in shares)	1,915,435		1,915,435
Weighted average exercise price of stock options
Outstanding, beginning of the period (in dollars per share)			$ 39.27
Granted (in dollars per share)	$ 49.18		$ 49.18
Forfeited (in dollars per share)	$ 41.87		$ 41.87
Exercised (in dollars per share)	$ 38.62		$ 38.62
Outstanding, end of the period (in dollars per share)	$ 41.94		$ 41.94
Vested and expected to vest at the end of period (in dollars per share)	$ 41.83		$ 41.83
Exercisable, end of period (in dollars per share)	$ 39.80		$ 39.80
Tenure of award (in years)			10 Years
Additional disclosures
Vesting period (in years)			3 Years
Nonvested restricted stock awards
Nonvested restricted stock awards and units
Outstanding, beginning of period (in shares)			22,309
Awarded (in shares)			16,898
Vested (in shares)			(22,309)
Outstanding, ending of period (in shares)	16,898		16,898
Weighted average exercise price of nonvested restricted stock award and units
Outstanding, beginning of period (in dollars per share)			$ 39.23
Awarded (in dollars per share)			$ 51.80
Vested (in dollars per share)			$ 39.23
Outstanding, ending of period (in dollars per share)	$ 51.80		$ 51.80
Nonvested restricted stock units
Nonvested restricted stock awards and units
Outstanding, beginning of period (in shares)			190,488
Awarded (in shares)			112,543
Vested (in shares)			(90,853)
Forfeited (in shares)			(1,674)
Outstanding, ending of period (in shares)	210,504		210,504
Weighted average exercise price of nonvested restricted stock award and units
Outstanding, beginning of period (in dollars per share)			$ 38.43
Awarded (in dollars per share)			$ 49.10
Vested (in dollars per share)			$ 37.50
Forfeited (in dollars per share)	$ 42.31		$ 42.31
Outstanding, ending of period (in dollars per share)	$ 44.49		$ 44.49
Additional disclosures
Vesting period (in years)			3 Years