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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income before taxes |  |  |
Domestic | $ (12,535) | $ (61,036) | $ (3,586)
Foreign | 518 | (56,849) | (22,215)
Loss before income taxes | (12,017) | (117,885) | (25,801)
Federal: |  |  |
Current | 19,319 | 15,048 | 16,595
Deferred | 2,200 | 587 | (255)
State: |  |  |
Current | 47 | (2,868) | 17
Deferred | (501) | 2,934 | 0
Foreign: |  |  |
Current | 446 | 543 | 886
Deferred | 220 | 207 | 9
Provision for (benefit from) income taxes | 21,731 | 16,451 | 17,252
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) | (3.30%) | 0.10% | (0.10%)
Withholding tax (as a percent) | 160.40% | 13.30% | 64.20%
Foreign rate differential (as a percent) | 4.10% | 17.40% | 33.00%
Research and development ("R&D") credit (as a percent) | (36.70%) | 0.00% | (1.00%)
Executive compensation (as a percent) | 0.80% | 0.30% | 2.00%
Non-deductible stock-based compensation (as a percent) | 2.50% | 0.70% | 2.80%
Foreign tax credit (as a percent) | (163.30%) | (13.30%) | (197.70%)
Capitalized merger and acquisition costs (as a percent) | 0.00% | 0.30% | 5.90%
Other (as a percent) | (1.00%) | (2.20%) | 0.50%
Valuation allowance (as a percent) | 252.30% | 32.40% | 192.30%
Effective tax rate (as a percent) | 180.80% | 14.00% | 66.90%
Components of net deferred tax assets |  |  |
Depreciation and amortization | 28,093 | 20,230 |
Other liabilities and reserves | 18,578 | 19,624 |
Deferred equity compensation | 33,837 | 42,546 |
Net operating loss carryovers | 27,416 | 38,133 |
Tax credits | 100,052 | 76,826 |
Total gross deferred tax assets | 207,976 | 197,359 |
Convertible debt | (12,664) | (8,019) |
Total net deferred tax assets | 195,312 | 189,340 |
Valuation allowance | (192,823) | (184,817) |
Net deferred tax assets | 2,489 | 4,523 |
Net deferred tax assets reported as: |  |  |
Current deferred tax assets | 205 | 788 |
Deferred Tax Liabilities, Net | (791) |  |
Non-current deferred tax assets | 4,797 | 4,458 |
Non-current deferred tax liabilities | (1,722) | (723) |
Net deferred tax assets | $ 2,489 | $ 4,523 |

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