Stock-Based Compensation Narrative (Details)	3 Months Ended
Mar. 31, 2013
Statement [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term	10 years
Directors' Plan [Member]
Statement [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1	1 year
Shares reserved for future grants under the stock option and compensation plan	469,000
Employee Stock Option [Member]
Statement [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1	3 years
Shares reserved for future grants under the stock option and compensation plan	11,800,000

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-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 b(1)(a, 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant