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.

Reference 1: 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 2: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: 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

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

-Publisher FASB

-Name Accounting Standards Codification

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

Reference 5: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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Balance Type:	debit
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- Definition

The first period of time during which the performance of the stock will be evaluated to calculate the earning of the stock based awards

+ References

No definition available.

+ Details

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- Definition

The second period of time during which the performance of the stock will be evaluated to calculate the earning of the stock based awards

+ References

No definition available.

+ Details

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- Definition

Percentage of shareholder return required under any plan before any payments will be awarded.

+ References

No definition available.

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- Definition

Minimum percentage of shareholder return for three years before any payout is made under the out performance plan.

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- Definition

Minimum cumulative percentage of shareholder return for the two years before any payout is made under the out performance plan.

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No definition available.

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- Definition

Required percentage of shareholder return under the Relative plan. If this percentage is not met, then the total award is reduced based on the absolute TSR plan.

+ References

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- Definition

Percentage of total awards to be vested in year five.

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- Definition

Percentage of total awards to be vested in year four.

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- Definition

Percentage of total awards to be vested in year three.

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Incentive Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense (in US Dollars)	$ 9,129	$ 8,438	$ 16,595	$ 15,047
Out Performance Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Duration Of First Performance Measurement Period			2 years
Duration Of Second Performance Measurement Period			3 years
Award vesting in three years			33.00%
Award vesting in four years			33.00%
Award vesting in five years			34.00%
Out Performance Plan And Absolute Component [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Required Shareholder Return Two Year			14.00%
Required Shareholder Return Three Year			21.00%
Percentage Of Shareholder Return Under Which No Awards Will Be Earned			0.00%
Out Performance Plan And Relative Component [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Required Shareholder Return Under Relative Component			6.00%