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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Statutory federal rate | 21.00% | 21.00% | 35.00%
Provisional net tax benefit related to reduction in U.S. corporate tax rate |  | $ (8,400) |
Provisional one-time tax expense resulting from transition tax |  | 10,600 |
Net tax benefit related to reduction in U.S. corporate tax rate |  | (71) |
U.S. transition tax |  | (3,271) | $ 10,612
Net GILTI | $ 1,861 | 347 |
Foreign withholding tax | 638 | 5,590 |
Increase (Decrease) in valuation allowance | (345) | 567 | 636
U.S federal net operating loss carryforwards | $ 93,300 | 86,300 |
Period to utilize the net operating loss carryforwards | 23 years |  |
NOL carryforward used in period | $ 20,600 | 11,900 |
Foreign operating loss carryforwards | 3,400 | 5,900 |
Foreign operating loss carryforward, no expiration | 2,400 | 5,200 |
Foreign operating loss carryforward, expiring | 1,000 | 761 |
Unrecognized tax benefits including interest and penalties | 2,500 | 3,300 |
Unrecognized tax benefits that would impact effective rate | 2,200 | 3,000 |
Unrecognized tax benefits reduction to non-current deferred income tax assets | 230 | 0 |
Reduction of uncertain tax benefits related to certain liabilities for unrecognized tax benefits | 307 |  |
Accrued interest and penalties | 366 | 373 |
Income tax penalties and interest expense | (7) | $ 69 | $ 88
Maximum |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Estimated decrease in unrecognized tax benefit in next twelve months | $ 650 |  |

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