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Fair Value Measurements (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | [1] | Dec. 31, 2016 | Sep. 30, 2016 | [1] | Jun. 30, 2016 | [1] | Mar. 31, 2016 | [1] | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived License Agreements | $ 93,259,000 |  |  |  | $ 86,622,000 |  |  |  |  | $ 88,106,000 | $ 93,259,000 | $ 86,622,000 | $ 88,106,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 1,449,000 | $ 0 | $ 0 | $ 0 | $ 0 | [1] | $ 0 | $ 0 | $ 0 | 874,000 | 1,449,000 | $ 0 | 874,000
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived License Agreements | 3,649,000 |  |  |  |  |  |  |  |  | 13,282,000 | 3,649,000 |  | 13,282,000
Assets, Fair Value Disclosure, Nonrecurring | 2,200,000 |  |  |  |  |  |  |  |  | 12,408,000 | $ 2,200,000 |  | $ 12,408,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 1,449,000 |  |  |  |  |  |  |  |  | $ 874,000 |  |  |
[1] | Certain prior year amounts and March 31, 2017 quarterly data have been reclassified to conform with current presentation.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Details
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