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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax credit and operating loss carryforwards |  |  |
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit | $ 21,400 | $ 20,400 |
Unrecognized tax benefits included in long-term income taxes payable | 2,100 | 2,200 |
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | 2,100 | 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 | 22,652 | 21,925 | $ 20,836
Tax positions related to current year: |  |  |
Additions | 1,032 | 1,083 | 1,225
Tax positions related to prior years: |  |  |
Additions | 115 | 16 | 256
Reductions | (317) | (372) | (171)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | 0 | (221)
Balance at the end of the period | 23,482 | $ 22,652 | $ 21,925
Undistributed earnings | 12,100 |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings | $ 1,300 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% | 35.00%
Foreign Tax Credit |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | $ 215,500 |  |
Federal | Research and Development as label |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | 34,300 |  |
Federal | Foreign Tax Credit |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax Credit Carryforward, Subject To Expiration, Amount | 51,300 |  |
State and Local Jurisdiction [Member] |  |  |
Tax credit and operating loss carryforwards |  |  |
Operating Loss Carryforwards | 124,600 |  |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |  |
Tax credit and operating loss carryforwards |  |  |
Operating Loss Carryforwards | 244,100 |  |
State and Local Jurisdiction [Member] | Research and Development as label |  |  |
Tax credit and operating loss carryforwards |  |  |
Tax credit carryforwards | $ 28,500 |  |

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