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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 0 | $ 113,729 | $ 21,527
Income before taxes |  |  |
Domestic | (81,316) | (63,829) | 46,031
Foreign | (5,700) | (6,799) | (5,042)
Income (loss) before income taxes | (87,016) | (70,628) | 40,989
Federal: |  |  |
Current | 2,932 | 5,451 | 20,661
Deferred | 2,016 | 82,726 | 43,678
State: |  |  |
Current | 657 | 333 | 495
Deferred | (1,198) | 522 | (43)
Foreign: |  |  |
Current | 1,708 | 1,592 | 1,101
Deferred | (2,712) | (3,295) | (2,041)
Provision for (benefit from) income taxes | $ 3,403 | $ 87,329 | $ 63,851
Effective income tax rate reconciliation |  |  |
Expense (benefit) at U.S. federal statutory rate (as a percent) | 21.00% | 21.00% | 35.00%
Expense (benefit) at state statutory rate (as a percent) | 0.90% | (1.20%) | 0.70%
Withholding tax (as a percent) | (3.50%) | (7.70%) | 50.10%
Foreign rate differential (as a percent) | (1.10%) | (0.20%) | 2.80%
Research and development ("R&D") credit (as a percent) | 1.20% | 2.20% | (3.90%)
Executive compensation (as a percent) | (1.20%) | (0.10%) | 1.80%
Non-deductible stock-based compensation (as a percent) | (2.30%) | (2.80%) | 14.90%
Foreign tax credit (as a percent) | 3.40% | 7.70% | (50.10%)
Foreigh derived intangible income deduction (as a percent) | 4.60% | 14.80% | 0.00%
Impact of corporate rate change on deferred taxes (as a percent) | 0.00% | 0.00% | 50.60%
Divestiture (as a percent) | 4.80% | 0.00% | 0.00%
Other (as a percent) | (0.20%) | 0.70% | 1.40%
Valuation allowance (as a percent) | (31.50%) | (158.00%) | 52.50%
Effective tax rate (as a percent) | (3.90%) | (123.60%) | 155.80%
Components of net deferred tax assets |  |  |
Depreciation and amortization | $ 13,995 | $ 13,085 |
Lease liabilities | 10,734 | 0 |
Other liabilities and reserves | 9,522 | 8,272 |
Deferred equity compensation | 4,456 | 6,236 |
Net operating loss carryovers | 20,900 | 21,259 |
Tax credits | 233,407 | 253,890 |
Total gross deferred tax assets | 293,014 | 302,742 |
Lease right-of-use assets | (10,400) | 0 |
Convertible debt | (151) | (207) |
Deferred revenue | (94,763) | (143,182) |
Deferred Tax Liabilities, Gross | (105,314) | (143,389) |
Valuation allowance | (196,972) | (173,878) |
Total net deferred tax assets | 187,700 | 159,353 |
Net deferred tax assets reported as: |  |  |
Non-current deferred tax assets | 4,574 | 4,435 |
Non-current deferred tax liabilities | (13,846) | (18,960) |
Net deferred tax liabilities | $ (9,272) | $ (14,525) |

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