v2.4.0.6

Stock Options Plans and Stock-Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011 Y
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 0.55
Range of Exercise Price, Maximum	$ 35.96
Number of Outstanding Options	2,561,292
Options Outstanding Weighted Average Remaining Contractual Life	4.36
Weighted Average Exercise Price	$ 17.17
Number Exercisable	1,397,605
Weighted Average Exercise Price	$ 14.51
Range of Exercise Prices One [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 0.55
Range of Exercise Price, Maximum	$ 7.76
Number of Outstanding Options	350,786
Options Outstanding Weighted Average Remaining Contractual Life	3.07
Weighted Average Exercise Price	$ 5.40
Number Exercisable	295,500
Weighted Average Exercise Price	$ 4.96
Range of Exercise Prices Two [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 8.10
Range of Exercise Price, Maximum	$ 13.46
Number of Outstanding Options	278,793
Options Outstanding Weighted Average Remaining Contractual Life	3.79
Weighted Average Exercise Price	$ 11.54
Number Exercisable	149,955
Weighted Average Exercise Price	$ 12.41
Range of Exercise Prices Three [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 13.74
Range of Exercise Price, Maximum	$ 14.13
Number of Outstanding Options	203,331
Options Outstanding Weighted Average Remaining Contractual Life	3.51
Weighted Average Exercise Price	$ 14.07
Number Exercisable	147,630
Weighted Average Exercise Price	$ 14.06
Range of Exercise Prices Four [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 14.52
Range of Exercise Price, Maximum	$ 14.52
Number of Outstanding Options	509,475
Options Outstanding Weighted Average Remaining Contractual Life	5.20
Weighted Average Exercise Price	$ 14.52
Number Exercisable	147,242
Weighted Average Exercise Price	$ 14.52
Range of Exercise Prices Five [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 14.54
Range of Exercise Price, Maximum	$ 17.60
Number of Outstanding Options	258,210
Options Outstanding Weighted Average Remaining Contractual Life	2.67
Weighted Average Exercise Price	$ 16.21
Number Exercisable	243,993
Weighted Average Exercise Price	$ 16.19
Range of Exercise Prices Six [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 17.70
Range of Exercise Price, Maximum	$ 18.74
Number of Outstanding Options	266,045
Options Outstanding Weighted Average Remaining Contractual Life	5.07
Weighted Average Exercise Price	$ 18.20
Number Exercisable	146,458
Weighted Average Exercise Price	$ 18.08
Range of Exercise Prices Seven [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 19.85
Range of Exercise Price, Maximum	$ 24.53
Number of Outstanding Options	346,397
Options Outstanding Weighted Average Remaining Contractual Life	4.40
Weighted Average Exercise Price	$ 23.27
Number Exercisable	255,272
Weighted Average Exercise Price	$ 22.82
Range of Exercise Prices Eight [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 24.88
Range of Exercise Price, Maximum	$ 29.85
Number of Outstanding Options	32,555
Options Outstanding Weighted Average Remaining Contractual Life	4.90
Weighted Average Exercise Price	$ 28.47
Number Exercisable	11,555
Weighted Average Exercise Price	$ 27.19
Range of Exercise Prices Nine [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 33.48
Range of Exercise Price, Maximum	$ 33.48
Number of Outstanding Options	308,200
Options Outstanding Weighted Average Remaining Contractual Life	6.19
Weighted Average Exercise Price	$ 33.48
Number Exercisable	0
Weighted Average Exercise Price	$ 0.00
Range of Exercise Prices Ten [Member]
Summary of information about stock options outstanding
Range of Exercise Price, Minimum	$ 35.96
Range of Exercise Price, Maximum	$ 35.96
Number of Outstanding Options	7,500
Options Outstanding Weighted Average Remaining Contractual Life	6.50
Weighted Average Exercise Price	$ 35.96
Number Exercisable	0
Weighted Average Exercise Price	$ 0.00

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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.



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

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-Topic 718

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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.

+ References

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-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.



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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

-Publisher FASB

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-Topic 718

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- Definition

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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