Employee Benefit Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plan (Details) [Abstract]
Maximum contribution % of eligible pre-tax compensation allowed to participants of defined contribution plan	50.00%
Maximum employer contribution match % (of total eligible compensation) to each participant	4.00%
Our matching cash contributions represents this % of employees' contributions	50.00%
Our common stock % in total plan assets	10.00%	12.00%	12.00%
Our contributions match	$ 5.3	$ 5.8	$ 5.7

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Employer matching cash contributions represent percentage of employees contributions.

+ References

No definition available.

+ Details

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- Definition

Maximum contribution percentage of pre-tax compensation allowed to participants of defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Maximum employer contribution match percentage of total eligible compensation to each participant.

+ References

No definition available.

+ Details

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- Definition

Our common stock percentage in total plan assets of defined contribution plan.

+ References

No definition available.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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