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Stock-Based Compensation and Stockholders' Equity (Net Capital Deficiency) (Details 3) (USD $) | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Stock options | Sep. 30, 2011 Stock options | Sep. 30, 2012 Stock options | Sep. 30, 2011 Stock options | Sep. 30, 2012 Stock options Minimum | Sep. 30, 2011 Stock options Minimum | Sep. 30, 2012 Stock options Maximum | Sep. 30, 2011 Stock options Maximum | Sep. 30, 2012 Stock options 2004 and 2012 Plans | Sep. 30, 2011 Stock options 2004 and 2012 Plans | Sep. 30, 2012 RSUs 2004 and 2012 Plans Time-Based | Sep. 30, 2011 RSUs 2004 and 2012 Plans Time-Based | Sep. 30, 2012 RSAs 2004 and 2012 Plans Time-Based | Sep. 30, 2011 RSAs 2004 and 2012 Plans Time-Based | Feb. 29, 2012 RSAs 2004 and 2012 Plans Performance-Contingent | Sep. 30, 2012 RSAs 2004 and 2012 Plans Performance-Contingent item | Sep. 30, 2012 RSAs 2004 and 2012 Plans Performance-Contingent item | Sep. 30, 2011 RSAs 2004 and 2012 Plans Performance-Contingent | Dec. 31, 2011 RSAs 2004 and 2012 Plans Performance-Contingent
Compensation Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Compensation Awards Granted (in shares) |  |  |  |  |  |  |  |  |  |  | 269,000 | 582,250 |  |  |  |  |  |  |  |  |
Number of Compensation Awards Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 528,381 | 465,000 | 402,500 | 1,168,000 | 44,500 |  | 44,500 | 1,315,000 | 1,290,000
Weighted-Average Exercise Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 21.83 | $ 22.06 |  |  |  |  |  |  |  |  |
Weighted-Average Fair Value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.45 | $ 25.03 | $ 18.11 | $ 24.59 |  |  | $ 18.11 | $ 24.26 |
Number of possible performance conditions, achievement of which not probable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |
Number of possible performance conditions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |
Compensation expense | $ 18,044,000 | $ 18,706,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |
Weighted-average assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate, minimum (as a percent) |  |  | 0.83% | 1.20% | 0.74% | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate, maximum (as a percent) |  |  | 0.86% | 2.17% | 1.17% | 2.57% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  | 6 years | 6 years |  |  | 5 years | 5 years | 6 years | 6 years |  |  |  |  |  |  |  |  |  |  |
Volatility (as a percent) |  |  | 57.00% | 53.00% |  |  | 55.00% | 49.00% | 60.00% | 55.00% |  |  |  |  |  |  |  |  |  |  |
Weighted-average estimated fair value of ESPP issuances (in dollars per share) |  |  | $ 14.31 | $ 9.74 | $ 11.41 | $ 11.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity (net capital deficiency): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  | 882,666 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares exercised, Weighted-Average Exercise Price of Outstanding Options (in dollars per share) |  |  |  |  | $ 8.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash proceed |  |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -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 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 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 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 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. + Details
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- Definition 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 Reference 1: 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.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition 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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -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 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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