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Summary of Significant Accounting Policies (Details) - shares shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted Average Number of Shares Outstanding, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 111,476 | 116,444 | 116,027 | 115,336 | 115,024 | 114,523 | 114,116 | 113,590 | 114,814 | 114,318 | 112,415
Financial Statement Presentation |  |  |  |  |  |  |  |  |  |  |
Maximum ownership percentage |  |  |  |  |  |  |  |  | 20.00% |  |
Royalty Revenue |  |  |  |  |  |  |  |  |  |  |
Number of types of royalty revenue streams |  |  |  |  |  |  |  |  | 2 |  |
Stock-Based Compensation and Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |
Discount from the fair market value (as a percent) |  |  |  |  |  |  |  |  | 15.00% |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |
Maximum original maturity of cash equivalents (in months) |  |  |  |  |  |  |  |  | 3 months |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  | 1 year | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  | 10 years | 10 years |

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