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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes [Line Items] |  |  |
Income tax benefit from release of valuation allowance | $ 10,651,000 | $ 0 | $ 0
Deferred Tax Assets, Valuation Allowance | 5,396,000 | 19,537,000 |
Operating loss carryforwards, federal | 37,855,000 |  |
Federal NOL Annual Utilization Limit | 14,100,000 |  |
Operating loss carryforwards, state | 55,559,000 |  |
Net operating losses, unrecognized excess tax benefits, federal | 1,928,000 |  |
Net operating losses, unrecognized excess tax benefits, state | 33,166,000 |  |
Tax benefit from stock options exercised, federal | 0 |  |
Tax fenefit from stock options exercised, state | 554,000 |  |
Foreign withholding taxes |  | 7,586,000 |
Excess tax benefits from stock-based compensation | 13,210,000 | 583,000 | 1,302,000
Foreign tax credits, additional paid in capital benefit | 20,313,000 |  |
Cash Paid For Foreign Income Taxes | 11,890,000 | 7,586,000 | 268,000
Unrecognized tax benefits | 2,127,000 | 85,000 |
unrecognized tax benefits primarily associated with state taxes | 0 |  |
Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating losses included in deferred tax assets | 0 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating losses included in deferred tax assets | 554,000 |  |
Capital Loss Carryforward [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 2,935,000 |  |
Capital Loss Carryforward [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 2,046,000 |  |
Valuation Allowance, Other Tax Carryforward [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 415,000 |  |
Capital Loss Carryforward Related to Business Acquisition [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, federal | $ 33,736,000 |  |

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