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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Federal: |  |  |
Current | $ 15,048 | $ 16,595 | $ 55,332
Deferred | 587 | (255) | 255
State: |  |  |
Current | (2,868) | 17 | 1,467
Deferred | 2,934 | 0 | 0
Foreign: |  |  |
Current | 543 | 886 | 401
Deferred | 207 | 9 | (328)
Provision for (benefit from) income taxes | 16,451 | 17,252 | 57,127
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) | 0.10% | (0.10%) | 0.50%
Withholding tax (as a percent) | 13.30% | 64.20% | 17.30%
Foreign rate differential (as a percent) | 17.40% | 33.00% | 2.40%
Research and development ("R&D") credit (as a percent) | 0.00% | (1.00%) | (0.30%)
Executive compensation (as a percent) | 0.30% | 2.00% | 0.70%
Non-deductible stock-based compensation (as a percent) | 0.70% | 2.80% | 0.30%
Foreign tax credit (as a percent) | (13.30%) | (197.70%) | 0.00%
Capitalized merger and acquisition costs (as a percent) | 0.30% | 5.90% | 0.00%
Other (as a percent) | (2.20%) | 0.50% | (1.40%)
Valuation allowance (as a percent) | 32.40% | 192.30% | (27.00%)
Effective tax rate (as a percent) | 14.00% | 66.90% | 27.50%
Components of net deferred tax assets |  |  |
Depreciation and amortization | 20,230 | 2,063 |
Other liabilities and reserves | 19,624 | 35,050 |
Deferred equity compensation | 64,193 | 58,329 |
Net operating loss carryovers | 38,133 | 8,432 |
Tax credits | 76,826 | 58,314 |
Total gross deferred tax assets | 219,006 | 162,188 |
Convertible debt | (8,019) | (12,932) |
Total net deferred tax assets | 210,987 | 149,256 |
Valuation allowance | (206,464) | (140,982) |
Net deferred tax assets | 4,523 | 8,274 |
Net deferred tax assets reported as: |  |  |
Current deferred tax assets | 788 | 2,798 |
Non-current deferred tax assets | 4,458 | 7,531 |
Non-current deferred tax liabilities | (723) | (2,055) |
Net deferred tax assets | $ 4,523 | $ 8,274 |

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