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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax credit and operating loss carryforwards |  |  |
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit | $ 19,700 | $ 18,600 |
Unrecognized tax benefits included in long-term income taxes payable | 2,200 | 2,200 |
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | 2,200 | 2,200 |
Amount of potential unrecognized tax benefit | 200 |  |
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits |  |  |
Balance at the beginning of the period | 20,836 | 19,903 | $ 18,794
Tax positions related to current year: |  |  |
Additions | 1,225 | 1,186 | 1,134
Tax positions related to prior years: |  |  |
Additions | 256 | 0 | 531
Reductions | (171) | (35) | (556)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | (221) | (218) | 0
Balance at the end of the period | 21,925 | $ 20,836 | $ 19,903
Undistributed earnings | 6,700 |  |
Alternative Minimum Tax Credits |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | 2,500 |  |
Foreign Tax Credit |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | 120,300 |  |
Federal |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards subject to expiration | 55,000 |  |
Federal | Research and Development as label |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | 36,500 |  |
Federal | Excess Tax Benefits From Stock Option Tax Deductions |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | 38,200 |  |
State and Local Jurisdiction [Member] |  |  |
Tax credit and operating loss carryforwards |  |  |
Operating Loss Carryforwards | 99,700 |  |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |  |
Tax credit and operating loss carryforwards |  |  |
Operating Loss Carryforwards | 274,600 |  |
Operating Loss Carryforwards, Expired | 3,200 |  |
Operating Loss Carryforwards, Expiring in the Future | 64,500 |  |
State and Local Jurisdiction [Member] | Research and Development as label |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | 24,700 |  |
State and Local Jurisdiction [Member] | Excess Tax Benefits From Stock Option Tax Deductions |  |  |
Tax credit and operating loss carryforwards |  |  |
Operating Loss Carryforwards | $ 98,200 |  |

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