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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

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