Stock-Based Compensation Plans (Details 1)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assumptions used for the Black-Scholes option-pricing model to determine the per share weighted average fair value for options granted
Expected life (years)	5 years	9 years 10 months 24 days	5 years
Risk-free interest rate	0.70%	3.30%	2.20%
Expected volatility	48.20%	48.00%	50.00%
Expected dividend yield	1.20%	1.30%	2.00%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

-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 e(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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