Share-Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2014 plan
Share-Based Compensation
Number of stock-based compensation plans	3
Share-Based Compensation
Number of shares of common stock available for issuance	8,362,456
Nonvested stock awards
Share-Based Compensation
Percentage increments vested on the second, third and fourth anniversaries of the grant date	33.33%
Vesting period	4 years
Purchase price (in dollars per share)	0
Stock Option Restoration Plan ("SORP")
Share-Based Compensation
Minimum holding term to surrender common stock by payment of exercise price on vested in-the-money options	6 months
Vesting period	6 months
1998 Stock Incentive Plan ("SI Plan")
Share-Based Compensation
Maximum number of shares of common stock authorized for issuance	30,000,000
Maximum term of non-qualified options vested	10 years 2 days
Percentage increments vested on the second, third and fourth anniversaries of the grant date	33.33%
1998 Executive Stock Award Plan ("ESA Plan")
Share-Based Compensation
Maximum number of shares of common stock authorized for issuance	3,750,000
Maximum term of non-qualified options vested	11 years
Percentage increments vested on the second, third and fourth anniversaries of the grant date	10% per year
NED Plan
Share-Based Compensation
Maximum number of shares of common stock authorized for issuance	1,200,000
Maximum term of non-qualified options vested	11 years
Percentage increments vested on the second, third and fourth anniversaries of the grant date	10% per year

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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.

+ 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 (a)(1)

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

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ References

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(2)

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

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)

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

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

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

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- Definition

Represents the minimum period that a holder of common stock of the Company must own the stock in order to participate in the Stock Option Restoration Program.

+ References

No definition available.

+ Details

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- Definition

Represents the number of stock-based compensation plans.

+ References

No definition available.

+ Details

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