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Income Taxes - Additional Information (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 16, 2010 | Dec. 31, 2008 | Dec. 31, 2012 Dynamic Acquisition | Jun. 30, 2011 Arena Acquisition | Jul. 16, 2010 Arena Acquisition | Dec. 31, 2013 Beginning Year | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum | Dec. 31, 2013 Ending Year | Dec. 31, 2013 Beginning tax year | Dec. 31, 2013 Beginning tax year as result of federal NOL carryforwards
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of deferred tax asset valuation allowance | $ (3,842,000) | $ 100,288,000 | $ 6,986,000 |  |  | $ 100,288,000 | $ 6,986,000 |  |  |  |  |  |  |
Alternative minimum tax credits, not subject to expiration | 13,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Federal net operating loss carryovers, subject to expiration | 2,600,000,000 |  |  | 629,800,000 | 298,400,000 |  |  | 119,900,000 |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  |  |  |  |  |  | 2023 |  |  | 2033 |  |
Unrecognized excess tax benefits from stock based compensation | 16,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits | 1,382,000 | 1,330,000 | 1,758,000 |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits, accrued gross interest | (100,000) | 30,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits, accrued liability | 100,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  |  |  |  | 2010 | 2003
Number of tax years open for state tax audit (in years) |  |  |  |  |  |  |  |  |  | 3 years | 5 years |  |  |
Decrease in gross unrecognized tax benefits balance within next twelve months | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 + Details
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