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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Valuation Allowance [Line Items] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 113,729 | $ 21,527 | $ 0 |
Income before taxes |  |  |  |
Domestic | (63,829) | 46,031 | 38,211 |
Foreign | (6,799) | (5,042) | (15,574) |
Income (loss) before income taxes | (70,628) | 40,989 | 22,637 |
Federal: |  |  |  |
Current | 5,451 | 20,661 | 22,115 |
Deferred | 82,726 | 43,678 | (2,198) |
State: |  |  |  |
Current | 333 | 495 | 884 |
Deferred | 522 | (43) | (271) |
Foreign: |  |  |  |
Current | 1,592 | 1,101 | 1,275 |
Deferred | (3,295) | (2,041) | (5,988) |
Provision for (benefit from) income taxes | $ 87,329 | $ 63,851 | $ 15,817 |
Effective income tax rate reconciliation |  |  |  |
Expense (benefit) at U.S. federal statutory rate (as a percent) | 21.00% | 35.00% | 35.00% |
Expense (benefit) at state statutory rate (as a percent) | (1.20%) | 0.70% | 1.80% |
Withholding tax (as a percent) | (7.70%) | 50.10% | 97.00% |
Foreign rate differential (as a percent) | (0.20%) | 2.80% | 4.10% |
Research and development ("R&D") credit (as a percent) | 2.20% | (3.90%) | (8.30%) |
Executive compensation (as a percent) | (0.10%) | 1.80% | 1.50% |
Non-deductible stock-based compensation (as a percent) | (2.80%) | 14.90% | 34.80% |
Foreign tax credit (as a percent) | 7.70% | (50.10%) | (97.00%) |
Foreigh derived intangible income deduction (as a percent) | 14.80% | 0.00% | 0.00% |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 0.00% | 50.60% | 0.00% |
Other (as a percent) | 0.70% | 1.40% | 1.00% |
Valuation allowance (as a percent) | (158.00%) | 52.50% | 0.00% |
Effective tax rate (as a percent) | (123.60%) | 155.80% | 69.90% |
Components of net deferred tax assets |  |  |  |
Depreciation and amortization | $ 13,085 | $ 10,840 |  |
Other liabilities and reserves | 8,272 | 8,766 |  |
Deferred equity compensation | 6,236 | 7,979 |  |
Net operating loss carryovers | 21,259 | 16,335 |  |
Tax credits | 253,890 | 157,051 |  |
Total gross deferred tax assets | 302,742 | 200,971 |  | $ 105,000
Convertible debt | (207) | (791) |  |
Deferred Tax Assets, Deferred Income | (143,182) | 0 |  |
Deferred Tax Liabilities, Gross | (143,389) | (791) |  |
Total net deferred tax assets | 159,353 | 200,180 |  |
Valuation allowance | (173,878) | (50,911) |  | (16,000)
Net deferred tax assets |  | 149,269 |  |
Net deferred tax assets reported as: |  |  |  |
Non-current deferred tax assets | 4,435 | 159,099 |  |
Non-current deferred tax liabilities | (18,960) | (9,830) |  |
Net deferred tax assets |  | $ 149,269 |  |
Net deferred tax liabilities | $ (14,525) |  |  | $ (174,000)

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