Amount of shares earned as a % of target award.

No definition available.

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- Definition

Award percentage earned based on metric over the performance period.

+ References

No definition available.

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- Definition

Percentage of the value of the incentive plan in earned cash.

+ References

No definition available.

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- Definition

Incentive Compensation Plan, Threshold Target Award for Granting Stock Award.

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No definition available.

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- Definition

Number of performance metrics in restricted shares award type plan.

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No definition available.

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- Definition

Percentage of the value of the incentive plan in restriced shares.

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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 (h)(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 g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph 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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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- Definition

The number of shares issued pursuant to the terms of the deferred compensation plan as of the balance sheet date.

+ References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

+ References

No definition available.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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).

+ References

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Equity Awards - Restricted Shares Narrative (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended			3 Months Ended
	Sep. 30, 2012 Restricted Shares [Member]	Sep. 30, 2011 Restricted Shares [Member]	Sep. 30, 2012 Restricted Shares [Member]	Sep. 30, 2011 Restricted Shares [Member]	Sep. 30, 2012 Restricted Shares [Member] Non-employee independent director [Member] Deferred Compensation, Share-based Payments [Member]	Mar. 31, 2012 Plan 1 [Member] Service-based restriced shares [Member]	Mar. 31, 2012 Plan 2 [Member] Service-based restriced shares [Member]	Sep. 30, 2012 Plan 3 [Member] number	Mar. 31, 2012 Plan 3 [Member] Restricted Shares [Member]	Mar. 31, 2012 Plan 3 [Member] Service-based restriced shares [Member]	Mar. 31, 2012 Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 Plan 4 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 Plan 5 [Member] Service-based restriced shares [Member]	Mar. 31, 2012 Plan 5 [Member] Service-based restriced shares [Member] Non-employee independent director [Member]	Mar. 31, 2012 Minimum [Member] Plan 2 [Member] Service-based restriced shares [Member]	Mar. 31, 2012 Minimum [Member] Plan 4 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 Maximum [Member] Plan 4 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 3 year cash flow metric [Member] Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 3 year cash flow metric [Member] Minimum [Member] Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 3 year cash flow metric [Member] Maximum [Member] Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 3 year EPS CAGR metric [Member] Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 3 year EPS CAGR metric [Member] Minimum [Member] Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 3 year EPS CAGR metric [Member] Maximum [Member] Plan 3 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 2012 EPS growth metric [Member] Plan 4 [Member] Performance-based restriced shares [Member]	Mar. 31, 2012 2012 & 2013 EPS CAGR metric [Member] Plan 4 [Member] Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued related to director fee deferrals					6,302
Number of Unvested Restricted Shares Granted			475,533			19,532	60,665		206,064	103,032,000	103,032,000	166,530		16,440
Award requisite service period						3 years	1 year			3 years			1 year
ICP, Threshold target for granting stock awards															$ 20,000
Cash value of incentive plan							80.00%
Restriced shares value of incentive plan							20.00%
Award vesting period											3 years
Award percentage earned based on metric over the performance period																		25.00%			75.00%			60.00%	40.00%
Number of performance metrics in restricted shares award type plan								2
Amount of shares earned % of target award																30.00%	250.00%		30.00%	200.00%		30.00%	250.00%
Unrecognized unvested restricted shares-based compensation expense	8,800,000		8,800,000
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense			1 year 7 months
Restricted shares-based compensation expense	$ 6,200,000	$ 2,400,000	$ 2,700,000	$ 800,000