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Income Taxes (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating loss carryforwards |  |  |
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit | $ 10,600,000 | $ 7,000,000 |
Unrecognized tax benefits included in long-term income taxes payable | 6,200,000 | 9,600,000 |
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | 2,000,000 | 2,600,000 |
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits |  |  |
Balance at the beginning of the period | 16,610,000 | 11,816,000 | 10,353,000
Tax positions related to current year: |  |  |
Additions | 589,000 | 608,000 | 1,401,000
Tax positions related to prior years: |  |  |
Additions | 1,521,000 | 4,911,000 | 140,000
Reductions | (1,947,000) | (725,000) | (78,000)
Balance at the end of the period | 16,773,000 | 16,610,000 | 11,816,000
Undistributed earnings | 6,700,000 |  |
Federal |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 79,200,000 |  |
Unrealized excess tax benefits from stock option deductions excluded from tax attributes | 93,500,000 |  |
Federal | Research and Development as label |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | 25,400,000 |  |
State |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 296,200,000 |  |
Unrealized excess tax benefits from stock option deductions excluded from tax attributes | 99,200,000 |  |
State | Research and Development as label |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | 11,300,000 |  |
Foreign Tax Authority | Foreign Tax Credit |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | $ 82,400,000 |  |

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