Stock-Based Compensation (Details 2) (Stock options, USD $)	12 Months Ended
Dec. 31, 2012
Exercise prices for stock options outstanding and exercisable:
Number of stock options outstanding (in shares)	7,908,300
Outstanding, Weighted-Average Remaining Contractual Term	6 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 27.21
Number of stock options exercisable (in shares)	3,746,166
Exercisable, Weighted-Average Remaining Contractual Term	6 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 25.98
Range of Exercise Prices $00.00 - $10.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 0.00
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 10.00
Number of stock options outstanding (in shares)	3,666
Outstanding, Weighted-Average Remaining Contractual Term	3 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 2.15
Number of stock options exercisable (in shares)	3,666
Exercisable, Weighted-Average Remaining Contractual Term	3 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 2.15
Range of Exercise Prices $10.01 - $15.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 10.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 15.00
Number of stock options outstanding (in shares)	587,033
Outstanding, Weighted-Average Remaining Contractual Term	6 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 14.83
Number of stock options exercisable (in shares)	202,633
Exercisable, Weighted-Average Remaining Contractual Term	6 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 14.83
Range of Exercise Prices $15.01 - $20.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 15.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 20.00
Number of stock options outstanding (in shares)	796,565
Outstanding, Weighted-Average Remaining Contractual Term	7 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 18.82
Number of stock options exercisable (in shares)	249,565
Exercisable, Weighted-Average Remaining Contractual Term	7 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 18.65
Range of Exercise Prices $20.01 - $25.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 20.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 25.00
Number of stock options outstanding (in shares)	1,931,812
Outstanding, Weighted-Average Remaining Contractual Term	5 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 22.15
Number of stock options exercisable (in shares)	1,160,212
Exercisable, Weighted-Average Remaining Contractual Term	6 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 21.05
Range of Exercise Prices $25.01 - $30.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 25.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 30.00
Number of stock options outstanding (in shares)	2,354,903
Outstanding, Weighted-Average Remaining Contractual Term	5 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 28.59
Number of stock options exercisable (in shares)	1,614,103
Exercisable, Weighted-Average Remaining Contractual Term	4 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 28.77
Range of Exercise Prices $30.01 - $35.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 30.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 35.00
Number of stock options outstanding (in shares)	485,601
Outstanding, Weighted-Average Remaining Contractual Term	9 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 33.89
Number of stock options exercisable (in shares)	59,501
Exercisable, Weighted-Average Remaining Contractual Term	4 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 31.93
Range of Exercise Prices $35.01 - $40.00
Exercise prices for stock options outstanding and exercisable:
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 35.01
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 40.00
Number of stock options outstanding (in shares)	1,748,720
Outstanding, Weighted-Average Remaining Contractual Term	8 years
Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 37.14
Number of stock options exercisable (in shares)	456,486
Exercisable, Weighted-Average Remaining Contractual Term	7 years
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 37.03

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)

-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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, 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.

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration