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Stockholders Equity (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Equity Incentive Plans [Member]
Valuation of options granted under the equity incentive plans and shares subject to purchase under the employee stock purchase plan
Average risk-free interest rate	0.81%	0.84%
Expected dividend yield	2.10%	1.70%
Expected life	4 years 6 months	4 years 6 months
Expected volatility	40.00%	40.00%
Weighted average fair value	$ 7.72	$ 10.05
Employee Stock Purchase Plan [Member]
Valuation of options granted under the equity incentive plans and shares subject to purchase under the employee stock purchase plan
Average risk-free interest rate	0.11%	0.14%
Expected dividend yield	2.10%	1.70%
Expected life	6 months	6 months
Expected volatility	25.00%	31.00%
Weighted average fair value	$ 5.97	$ 7.54

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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-Name Accounting Standards Codification

-Topic 718

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-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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Name Statement of Financial Accounting Standard (FAS)

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