Long-Term Incentive Plan (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
$1 - 6 [Member]
Summary of stock options outstanding
Range of Exercise Prices, lower limit	$ 1
Range of Exercise Prices, upper limit	$ 6
Number of Options Outstanding (a)	430
Weighted Average Exercise Price, Options Outstanding	$ 1.76
Weighted Average Remaining Life (years)	6 years
Number of stock options exercisable	430
Weighted Average Exercise Price, Options exercisable	$ 1.76
$7 - 14 [Member]
Summary of stock options outstanding
Range of Exercise Prices, lower limit	$ 7
Range of Exercise Prices, upper limit	$ 14
Number of Options Outstanding (a)	1,324
Weighted Average Exercise Price, Options Outstanding	$ 10.23
Weighted Average Remaining Life (years)	5 years 9 months 18 days
Number of stock options exercisable	1,154
Weighted Average Exercise Price, Options exercisable	$ 10.69
$15 - 17 [Member]
Summary of stock options outstanding
Range of Exercise Prices, lower limit	$ 15
Range of Exercise Prices, upper limit	$ 17
Number of Options Outstanding (a)	789
Weighted Average Exercise Price, Options Outstanding	$ 17.10
Weighted Average Remaining Life (years)	2 years 10 months 24 days
Number of stock options exercisable	789
Weighted Average Exercise Price, Options exercisable	$ 17.10
$18 - 23 [Member]
Summary of stock options outstanding
Range of Exercise Prices, lower limit	$ 18
Range of Exercise Prices, upper limit	$ 23
Number of Options Outstanding (a)	2,977
Weighted Average Exercise Price, Options Outstanding	$ 21.00
Weighted Average Remaining Life (years)	1 year 4 months 24 days
Number of stock options exercisable	2,977
Weighted Average Exercise Price, Options exercisable	$ 21.00
$1 - 23 [Member]
Summary of stock options outstanding
Range of Exercise Prices, lower limit	$ 1
Range of Exercise Prices, upper limit	$ 23
Number of Options Outstanding (a)	5,520
Weighted Average Exercise Price, Options Outstanding	$ 16.36
Weighted Average Remaining Life (years)	3 years
Number of stock options exercisable	5,350
Weighted Average Exercise Price, Options exercisable	$ 16.66

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

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- 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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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)

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

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

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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)

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- 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.

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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.

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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

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