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Stock-Based Compensation (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2009 | Nov. 30, 2009 | Apr. 03, 2011 | Jul. 04, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Year EmployeeGroup OptionPlan | Dec. 31, 2010 | Dec. 31, 2009
Stock-Based Compensation Expense (Textual) [Abstract] |  |  |  |  |  |  |  |
Shares available for grant under stock option plans |  |  |  |  |  | 6,272,762 |  |
Outstanding shares in stock option |  | 5,153,307 |  |  |  |  |  |
Minimum outstanding stock option exercise price |  | $ 23.00 |  |  |  |  |  |
Total shares purchased under option to purchase common stock | 4,900,694 |  |  |  |  |  |  |
Stock option buyback | $ 9,158,000 |  |  |  |  |  |  | $ (9,158,000)
Number of stock option plans |  |  |  |  |  | 2 |  |
Weighted-average grant-date fair values of stock options granted |  |  |  |  |  | $ 12.32 | $ 7.33 | $ 5.42
Number of groups within the employee population |  |  |  |  |  | 2 |  |
Percentage of stock options granted to senior management expected to vest |  |  |  |  |  | 66.00% |  |
Percentage of stock options granted to all other employees expected to vest |  |  |  |  |  | 68.00% |  |
Reduction in compensation expense due to revised estimated forfeiture rates |  |  | 80,000 | 600,000 |  |  |  |
Estimated forfeiture rate for unvested options for senior management |  |  |  |  |  | 13.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management |  |  |  |  |  | 14.00% |  |
Stock based compensation expense |  |  |  |  | 2,657,000 |  |  |
Income tax benefit recognized related to stock-based compensation expense |  |  |  |  |  | 2,660,000 | 996,000 | 3,070,000
Compensation expense capitalized |  |  |  |  |  | 0 | 0 |
Total intrinsic values of stock options exercised |  |  |  |  |  | 20,108,000 | 10,918,000 | 3,000
Total unrecognized compensation expense related to non-vested stock options |  |  |  |  |  | 13,289,000 |  |
Weighted-average period for unrecognized compensation expense related to non-vested stock options (years) |  |  |  |  |  | 1.7 |  |
Total fair values of stock options vested |  |  |  |  |  | 10,202,000 | 13,159,000 | 14,177,000
Stock-based compensation expense |  |  |  |  |  | $ 8,068,000 | $ 3,027,000 | $ 9,223,000
Maximum [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation Expense (Textual) [Abstract] |  |  |  |  |  |  |  |
Cash Payment for Eligible Options Under Tender Offer |  | $ 3.42 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation Expense (Textual) [Abstract] |  |  |  |  |  |  |  |
Cash Payment for Eligible Options Under Tender Offer |  | $ 0.05 |  |  |  |  |  |
General Stock Option Plan [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation Expense (Textual) [Abstract] |  |  |  |  |  |  |  |
Shares available for grant under stock option plans |  |  |  |  |  | 4,906,777 |  |
Expiration period of stock option plans |  |  |  |  |  | P10Y |  |
Vesting period for stock option plans |  |  |  |  |  | 4 years |  |
Stock Option and Incentive Plan [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation Expense (Textual) [Abstract] |  |  |  |  |  |  |  |
Shares available for grant under stock option plans |  |  |  |  |  | 1,365,985 |  |
Expiration period of stock option plans |  |  |  |  |  | P10Y |  |
Vesting period for stock option plans |  |  |  |  |  | 4 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph 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. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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