Stockholders' Equity (Details 2) (USD $)	12 Months Ended
Dec. 31, 2011 Y
Qualified Stock Option Plans [Member] \| Range Of Exercise Prices One [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 5.10
Stock Options Outstanding, Shares Outstanding	11,000
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	3.92
Stock Options Outstanding, Weighted - Average Exercise Price	$ 5.10
Stock Options, Intrinsic Value of Shares Outstanding	$ 252,000
Stock Options Exercisable, Shares Exercisable	11,000
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	3.92
Stock Options Exercisable, Weighted - Average Exercise Price	$ 5.10
Stock Options, Intrinsic Value of Shares Exercisable	252,000
Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Two [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 7.86
Exercise prices, upper range	$ 8.17
Stock Options Outstanding, Shares Outstanding	48,375
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	6.95
Stock Options Outstanding, Weighted - Average Exercise Price	$ 7.87
Stock Options, Intrinsic Value of Shares Outstanding	976,000
Stock Options Exercisable, Shares Exercisable	13,530
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	6.94
Stock Options Exercisable, Weighted - Average Exercise Price	$ 7.87
Stock Options, Intrinsic Value of Shares Exercisable	273,000
Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Three [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 9.69
Exercise prices, upper range	$ 9.97
Stock Options Outstanding, Shares Outstanding	207,955
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	6.83
Stock Options Outstanding, Weighted - Average Exercise Price	$ 9.69
Stock Options, Intrinsic Value of Shares Outstanding	3,813,000
Stock Options Exercisable, Shares Exercisable	64,535
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	6.83
Stock Options Exercisable, Weighted - Average Exercise Price	$ 9.69
Stock Options, Intrinsic Value of Shares Exercisable	1,184,000
Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Four [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 29.99
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding	249,000
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	9.90
Stock Options Outstanding, Weighted - Average Exercise Price	$ 34.41
Stock Options, Intrinsic Value of Shares Outstanding	0
Stock Options Exercisable, Shares Exercisable	0
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	0.00
Stock Options Exercisable, Weighted - Average Exercise Price	$ 0.00
Stock Options, Intrinsic Value of Shares Exercisable	0
Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Five [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 5.10
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding	516,330
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	8.26
Stock Options Outstanding, Weighted - Average Exercise Price	$ 21.34
Stock Options, Intrinsic Value of Shares Outstanding	5,041,000
Stock Options Exercisable, Shares Exercisable	89,065
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	6.49
Stock Options Exercisable, Weighted - Average Exercise Price	$ 8.85
Stock Options, Intrinsic Value of Shares Exercisable	1,709,000
Non-Qualified Stock Option Plans [Member] \| Range Of Exercise Prices One [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 7.86
Stock Options Outstanding, Shares Outstanding	36,525
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	6.92
Stock Options Outstanding, Weighted - Average Exercise Price	$ 7.86
Stock Options, Intrinsic Value of Shares Outstanding	737,000
Stock Options Exercisable, Shares Exercisable	16,325
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	6.92
Stock Options Exercisable, Weighted - Average Exercise Price	$ 7.86
Stock Options, Intrinsic Value of Shares Exercisable	329,000
Non-Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Two [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 8.01
Stock Options Outstanding, Shares Outstanding	275,000
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	4.75
Stock Options Outstanding, Weighted - Average Exercise Price	$ 8.01
Stock Options, Intrinsic Value of Shares Outstanding	5,505,000
Stock Options Exercisable, Shares Exercisable	50,000
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	4.75
Stock Options Exercisable, Weighted - Average Exercise Price	$ 8.01
Stock Options, Intrinsic Value of Shares Exercisable	1,001,000
Non-Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Three [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 34.50
Stock Options Outstanding, Shares Outstanding	5,000
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	9.92
Stock Options Outstanding, Weighted - Average Exercise Price	$ 34.50
Stock Options, Intrinsic Value of Shares Outstanding	0
Stock Options Exercisable, Shares Exercisable	0
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	0.00
Stock Options Exercisable, Weighted - Average Exercise Price	$ 0.00
Stock Options, Intrinsic Value of Shares Exercisable	0
Non-Qualified Stock Option Plans [Member] \| Range Of Exercise Prices Four [Member]
Share based compensation shares authorized under stock option plans exercise price range
Exercise prices, lower range	$ 7.86
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding	316,525
Stock Options Outstanding, Weighted - Average Remaining Contractual Life in Years	5.08
Stock Options Outstanding, Weighted - Average Exercise Price	$ 8.41
Stock Options, Intrinsic Value of Shares Outstanding	6,242,000
Stock Options Exercisable, Shares Exercisable	66,325
Stock Options Exercisable, Weighted- Average Remaining Contractual Life in Years	5.28
Stock Options Exercisable, Weighted - Average Exercise Price	$ 7.97
Stock Options, Intrinsic Value of Shares Exercisable	$ 1,330,000

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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- Definition

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

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-Name Accounting Standards Codification

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- Definition

The weighted average remaining life of the exercisable stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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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

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

-Publisher FASB

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-Number 123R

-Paragraph 64

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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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

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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

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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

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