Employee Benefit Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plan [Abstract]
Maximum contribution % of eligible pre-tax compensation allowed to participants of defined contribution plan	50.00%
Our matching cash contributions represents this % of contributions made by participants of defined contribution plan	50.00%
Maximum employer contribution match % (of total eligible compensation) to each participant of defined contribution plan	2.00%
Our common stock % in total plan assets	7.20%	6.80%
Our contributions match	$ 6.7	$ 6.6	$ 5.3

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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.

+ Details

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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

+ Details

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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