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v3.8.0.1

Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 21,527 |  |  |
Income before taxes |  |  |  |
Domestic |  | $ 46,031 | $ 38,211 | $ 58,498
Foreign |  | (5,042) | (15,574) | 1,733
Income before income taxes |  | 40,989 | 22,637 | 60,231
Federal: |  |  |  |
Current |  | 20,661 | 22,115 | 20,497
Deferred |  | 43,678 | (2,198) | (170,798)
State: |  |  |  |
Current |  | 495 | 884 | 609
Deferred |  | (43) | (271) | (1,933)
Foreign: |  |  |  |
Current |  | 1,101 | 1,275 | 443
Deferred |  | (2,041) | (5,988) | 25
Provision for (benefit from) income taxes |  | $ 63,851 | $ 15,817 | $ (151,157)
Effective income tax rate reconciliation |  |  |  |
Expense (benefit) at U.S. federal statutory rate (as a percent) |  | 35.00% | 35.00% | 35.00%
Expense (benefit) at state statutory rate (as a percent) |  | 0.70% | 1.80% | (1.50%)
Withholding tax (as a percent) |  | 50.10% | 97.00% | 34.10%
Foreign rate differential (as a percent) |  | 2.80% | 4.10% | 0.40%
Research and development ("R&D") credit (as a percent) |  | (3.90%) | (8.30%) | (2.30%)
Executive compensation (as a percent) |  | 1.80% | 1.50% | 0.50%
Non-deductible stock-based compensation (as a percent) |  | 14.90% | 34.80% | 5.30%
Foreign tax credit (as a percent) |  | (50.10%) | (97.00%) | (34.10%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  | 50.60% | 0.00% | 0.00%
Other (as a percent) |  | 1.40% | 1.00% | (0.60%)
Valuation allowance (as a percent) |  | 52.50% | 0.00% | (287.80%)
Effective tax rate (as a percent) |  | 155.80% | 69.90% | (251.00%)
Components of net deferred tax assets |  |  |  |
Depreciation and amortization | 10,840 | $ 10,840 | $ 22,348 |
Other liabilities and reserves | 8,766 | 8,766 | 12,268 |
Deferred equity compensation | 7,979 | 7,979 | 17,426 |
Net operating loss carryovers | 16,335 | 16,335 | 11,439 |
Tax credits | 157,051 | 157,051 | 120,660 |
Total gross deferred tax assets | 200,971 | 200,971 | 184,141 |
Convertible debt | (791) | (791) | (3,870) |
Total net deferred tax assets | 200,180 | 200,180 | 180,271 |
Valuation allowance | (50,911) | (50,911) | (23,529) |
Net deferred tax assets | 149,269 | 149,269 | 156,742 |
Net deferred tax assets reported as: |  |  |  |
Non-current deferred tax assets | 159,099 | 159,099 | 168,342 |
Non-current deferred tax liabilities | (9,830) | (9,830) | (11,600) |
Net deferred tax assets | $ 149,269 | $ 149,269 | $ 156,742 |

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