Stockholders' Equity and Stock Incentive Plans (Stock Options by Exercise Price Range) (Details) (USD $)	12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	10,826,004
Options outstanding, weighted-average remaining contractual life	5 years 0 months 15 days
Options outstanding, weighted-average exercise price	$ 23.98
Options exercisable	9,545,547
Options exercisable, weighted-average exercise price	$ 26.31
Range of exercise prices, low	$ 5.22
Range of exercise prices, high	$ 52.35
$5.22-$5.22
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	537,840
Options outstanding, weighted-average remaining contractual life	9 years 10 months 6 days
Options outstanding, weighted-average exercise price	$ 5.22
Options exercisable	0
Options exercisable, weighted-average exercise price	$ 0.00
Range of exercise prices, low	$ 5.22
Range of exercise prices, high	$ 5.22
6.60-6.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	1,162,552
Options outstanding, weighted-average remaining contractual life	5 years 10 months 2 days
Options outstanding, weighted-average exercise price	$ 6.60
Options exercisable	1,162,552
Options exercisable, weighted-average exercise price	$ 6.60
Range of exercise prices, low	$ 6.60
Range of exercise prices, high	$ 6.60
6.70-6.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	537,840
Options outstanding, weighted-average remaining contractual life	8 years 11 months 5 days
Options outstanding, weighted-average exercise price	$ 6.70
Options exercisable	179,284
Options exercisable, weighted-average exercise price	$ 6.70
Range of exercise prices, low	$ 6.70
Range of exercise prices, high	$ 6.70
7.55-7.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	1,327,655
Options outstanding, weighted-average remaining contractual life	6 years 10 months 2 days
Options outstanding, weighted-average exercise price	$ 7.55
Options exercisable	1,327,655
Options exercisable, weighted-average exercise price	$ 7.55
Range of exercise prices, low	$ 7.55
Range of exercise prices, high	$ 7.55
8.34-8.34
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	1,160,533
Options outstanding, weighted-average remaining contractual life	7 years 9 months 29 days
Options outstanding, weighted-average exercise price	$ 8.34
Options exercisable	776,472
Options exercisable, weighted-average exercise price	$ 8.34
Range of exercise prices, low	$ 8.34
Range of exercise prices, high	$ 8.34
11.28-33.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	470,928
Options outstanding, weighted-average remaining contractual life	10 months 10 days
Options outstanding, weighted-average exercise price	$ 16.35
Options exercisable	470,928
Options exercisable, weighted-average exercise price	$ 16.35
Range of exercise prices, low	$ 11.28
Range of exercise prices, high	$ 33.31
36.76-36.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	1,436,827
Options outstanding, weighted-average remaining contractual life	1 year 11 months 9 days
Options outstanding, weighted-average exercise price	$ 36.76
Options exercisable	1,436,827
Options exercisable, weighted-average exercise price	$ 36.76
Range of exercise prices, low	$ 36.76
Range of exercise prices, high	$ 36.76
38.11-38.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	491,000
Options outstanding, weighted-average remaining contractual life	4 years 11 months 5 days
Options outstanding, weighted-average exercise price	$ 38.11
Options exercisable	491,000
Options exercisable, weighted-average exercise price	$ 38.11
Range of exercise prices, low	$ 38.11
Range of exercise prices, high	$ 38.11
39.00-39.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	1,336,500
Options outstanding, weighted-average remaining contractual life	3 years 10 months 2 days
Options outstanding, weighted-average exercise price	$ 39.00
Options exercisable	1,336,500
Options exercisable, weighted-average exercise price	$ 39.00
Range of exercise prices, low	$ 39.00
Range of exercise prices, high	$ 39.00
39.78-52.35
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	2,364,329
Options outstanding, weighted-average remaining contractual life	3 years 8 months 19 days
Options outstanding, weighted-average exercise price	$ 39.95
Options exercisable	2,364,329
Options exercisable, weighted-average exercise price	$ 39.95
Range of exercise prices, low	$ 39.78
Range of exercise prices, high	$ 52.35

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

- 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