Stock-Based Incentive Plans (Details) (USD $)	12 Months Ended
Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 2,822,000	$ 40,994,000	$ 541,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested In Period, Fair Value	0	209,000	587,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	11,043,000	6,914,000	6,291,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	23,975,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1.9
Aggregate fair value of restricted stock units that vested during the period	257,000	158,000	84,000
Unrecognized Compensation Expense, Restricted Stock Units	$ 367,000
Common Stock, Capital Shares Reserved for Future Issuance	1,131,000
Restricted Stock [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Restricted Stock, Granted, Weighted Average Grant Date Fair Value	$ 29.24	$ 8.61	$ 3.51
Restricted Stock Units (RSUs) [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Restricted Stock, Granted, Weighted Average Grant Date Fair Value	$ 24.87	$ 11.99	$ 3.50
2002 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Increase Per Year	500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	20,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	598,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Increase By Percentage	3.00%
2007 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	560,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Increase By Percentage	2.00%

Aggregate fair value of restricted stock units that vested during the period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Increase By Percentage

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Increase Per Year

+ References

No definition available.

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- Definition

Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested In Period, Fair Value

+ References

No definition available.

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- Definition

Unrecognized Compensation Expense, Restricted Stock Units

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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- Definition

The discount rate from market value on purchase date that participants pay for shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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(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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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