Long-term Equity-based Compensation - Schedule of Outstanding Options (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Shares Subject to Options	3,192,054	3,632,398
Outstanding Weighted Average Exercise Price	$ 40.53	$ 40.70
Outstanding Weighted Average Remaining Contractual Life	3 years 11 months 19 days
Range of Exercise Prices $10.00 - $15.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 10.00
Range of Exercise Prices, Upper Range Limit	$ 15.00
Outstanding Shares Subject to Options	38,000
Outstanding Weighted Average Exercise Price	$ 13.55
Outstanding Weighted Average Remaining Contractual Life	6 years 1 month 2 days
Exercisable Shares Subject to Options	38,000
Exercisable Weighted Average Exercise Price	$ 13.55
Range of Exercise Prices $15.01 - $20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 15.01
Range of Exercise Prices, Upper Range Limit	$ 20.00
Outstanding Shares Subject to Options	8,000
Outstanding Weighted Average Exercise Price	$ 16.48
Outstanding Weighted Average Remaining Contractual Life	6 years 4 months 6 days
Exercisable Shares Subject to Options	8,000
Exercisable Weighted Average Exercise Price	$ 16.48
Range of Exercise Prices $20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 20.01
Range of Exercise Prices, Upper Range Limit	$ 25.00
Outstanding Shares Subject to Options	293,750
Outstanding Weighted Average Exercise Price	$ 23.75
Outstanding Weighted Average Remaining Contractual Life	7 years 3 months 11 days
Exercisable Shares Subject to Options	161,312
Exercisable Weighted Average Exercise Price	$ 23.64
Range of Exercise Prices $25.01 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 25.01
Range of Exercise Prices, Upper Range Limit	$ 30.00
Outstanding Shares Subject to Options	584,750
Outstanding Weighted Average Exercise Price	$ 28.64
Outstanding Weighted Average Remaining Contractual Life	8 years 1 month 28 days
Exercisable Shares Subject to Options	266,123
Exercisable Weighted Average Exercise Price	$ 28.20
Range of Exercise Prices $30.01 - $35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 30.01
Range of Exercise Prices, Upper Range Limit	$ 35.00
Outstanding Shares Subject to Options	6,614
Outstanding Weighted Average Exercise Price	$ 31.92
Outstanding Weighted Average Remaining Contractual Life	5 years 10 months 2 days
Exercisable Shares Subject to Options	2,614
Exercisable Weighted Average Exercise Price	$ 31.18
Range of Exercise Prices $35.01 - $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 35.01
Range of Exercise Prices, Upper Range Limit	$ 40.00
Outstanding Shares Subject to Options	340,577
Outstanding Weighted Average Exercise Price	$ 37.25
Outstanding Weighted Average Remaining Contractual Life	4 years 9 months 22 days
Exercisable Shares Subject to Options	340,577
Exercisable Weighted Average Exercise Price	$ 37.25
Range of Exercise Prices $40.01 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 40.01
Range of Exercise Prices, Upper Range Limit	$ 45.00
Outstanding Shares Subject to Options	400,084
Outstanding Weighted Average Exercise Price	$ 43.56
Outstanding Weighted Average Remaining Contractual Life	1 year 5 months 16 days
Exercisable Shares Subject to Options	400,084
Exercisable Weighted Average Exercise Price	$ 43.56
Range of Exercise Prices $45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 45.01
Range of Exercise Prices, Upper Range Limit	$ 50.00
Outstanding Shares Subject to Options	1,185,747
Outstanding Weighted Average Exercise Price	$ 48.62
Outstanding Weighted Average Remaining Contractual Life	2 years 5 months 1 day
Exercisable Shares Subject to Options	1,185,747
Exercisable Weighted Average Exercise Price	$ 48.62
Range of Exercise Prices $50.01 - $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 50.01
Range of Exercise Prices, Upper Range Limit	$ 55.00
Outstanding Shares Subject to Options	334,532
Outstanding Weighted Average Exercise Price	$ 50.85
Outstanding Weighted Average Remaining Contractual Life	1 year 0 months 11 days
Exercisable Shares Subject to Options	334,532
Exercisable Weighted Average Exercise Price	$ 50.85
Range of Exercise Prices $10.00 - $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 10.00
Range of Exercise Prices, Upper Range Limit	$ 55.00
Outstanding Shares Subject to Options	3,192,054
Outstanding Weighted Average Exercise Price	$ 40.53
Outstanding Weighted Average Remaining Contractual Life	3 years 11 months 19 days
Exercisable Shares Subject to Options	2,736,989
Exercisable Weighted Average Exercise Price	$ 42.69

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

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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-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)(c), d(2)

-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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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 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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-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)(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.

+ Details

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

- Definition

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.

+ 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)(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 2: 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

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)(1)(i)-(ii)

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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.

+ Details

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

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ 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)

-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)

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

- Definition

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

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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 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