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Stock Based Awards and Other Equity Instruments (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Number of stock options issued | 3,651,000 |  |  |
Grant date fair value per option | $ 20.36 |  |  |
Common stock authorized | 10,000,000 |  |  |
Conversion of Stock [Line Items] |  |  |  |
Maximum number of shares granted | 7,000,000 |  |  |
Stock Based Awards and Other Equity Instruments (Textual) [Abstract] |  |  |  |
Stock-based compensation | $ 30,102,000 |  | $ 17,344,000 | $ 7,183,000
Total income tax benefit related to stock-based compensation expense | 10,600,000 |  | 6,500,000 | 2,000,000
Modification expenses of vested stock options | 8,000,000 |  |  |
Warrants issued in spinoff not listed on recognized stock exchange | 32,186,792 |  |  |
Conversion of warrant into common stock | 7,952,456 |  |  |
Expiration date of conversion | May 07, 2012 |  |  |
One Tranche of Warrants [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Exercise price of warrants prior to adjustment | $ 12.23 |  |  |
Common stock share exercisable for each warrant | 25.00% |  |  |
Exercise price per warrant | $ 6.48 |  |  |
Other Tranche of Warrants [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Exercise price of warrants prior to adjustment | $ 14.45 |  |  |
Common stock share exercisable for each warrant | 25.00% |  |  |
Exercise price per warrant | $ 7.66 |  |  |
2012 Stock Warrants [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Warrants Exercised | 32,186,791 | [1] |  |
Common stock issued in lieu of warrants | 7,952,456 |  |  |
Weighted average exercise price of warrants | $ 27.11 |  |  |
Outstanding warrants to purchase common stock | 31,641,337 |  |  |
Exercise proceeds received | $ 214,500,000 |  |  |
Cashless warrants exercised | 545,454 |  |  |
Weighted average exercise price of cashless warrants | $ 25.92 |  |  |
Warrants converted into common stock shares | 0 |  |  |
2012 Stock Warrants [Member] | Maximum [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Warrants converted into common stock shares at spin-off | 8,046,698 |  |  |
2011 Incentive Plan [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Number of stock options issued |  |  | 0 | 0
Stock Options [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Vesting period of stock options | 4 years |  |  |
Stock options vest period | 4 years |  |  |
Maximum number of stock options authorized for an individual | 3,000,000 |  |  |
Restricted Stock Units (RSU) [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Vesting period of stock options | 5 years |  |  |
RSU's withheld to satisfy minimum tax withholding requirements | 190,856 |  |  |
RSU's issued under incentive plan | 85,144 |  |  |
Stock options vest period | 5 years |  |  |
Fair value of RSU's issued | $ 35.76 |  |  |
RSU's awarded to non employee directors | 200,000 |  |  |
Maximum number of restricted stock authorized for an individual | 2,000,000 |  |  |
2012 Stock Option Activity [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Term of stock options, granted | 10 years |  |  |
Stock appreciation rights | 4 years |  |  |
Number of stock options issued | 3,650,814 |  |  |
Vested options and stock appreciation rights exercisable Period | 4 years |  |  |
Grant date fair value per option | $ 20.36 |  |  |
Closing stock price | $ 41.92 |  |  |
2012 RSU Activity [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Stock options vest period | 2 years |  |  |
[1] | Net of unrealized tax benefits of $72 for the year ended December 31, 2012.

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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: 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 2: 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 3: 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 4: 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 + 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 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). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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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