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Income Taxes (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating loss carryforwards |  |  |
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit | $ 12,600,000 | $ 10,600,000 |
Unrecognized tax benefits included in long-term income taxes payable | 6,200,000 | 6,200,000 |
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | 1,600,000 | 2,000,000 |
Amount of potential unrecognized tax benefit | 2,000,000 |  |
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits |  |  |
Balance at the beginning of the period | 16,773,000 | 16,610,000 | 11,816,000
Tax positions related to current year: |  |  |
Additions | 1,156,000 | 589,000 | 608,000
Tax positions related to prior years: |  |  |
Additions | 956,000 | 1,521,000 | 4,911,000
Reductions | (91,000) | (1,947,000) | (725,000)
Balance at the end of the period | 18,794,000 | 16,773,000 | 16,610,000
Undistributed earnings | 7,400,000 |  |
Alternative Minimum Tax Credits |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | 2,500,000 |  |
Foreign Tax Credit |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | 102,000,000 |  |
Federal |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 46,200,000 |  |
Tax credit carryforwards subject to expiration | 55,000,000 |  |
Income tax holiday, aggregate dollar amount | 4,700,000 |  |
Federal | Research and Development as label |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | 30,700,000 |  |
Federal | Excess Tax Benefits From Stock Option Tax Deductions |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 1,500,000 |  |
Tax credit carryforwards | 35,600,000 |  |
State |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 302,200,000 |  |
State | Research and Development as label |  |  |
Operating loss carryforwards |  |  |
Tax credit carryforwards | 14,900,000 |  |
State | Excess Tax Benefits From Stock Option Tax Deductions |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | $ 97,300,000 |  |

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