Fair Value Measurements (Narrative) (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2020 |
Jun. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
Indefinite-Lived License Agreements | $ 90,208,000 | $ 95,311,000 | $ 95,250,000 | ||
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 1,392,000 | $ 3,757,000 | 5,149,000 | $ 0 | $ 0 |
Licensing Agreements [Member] | |||||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
Indefinite-Lived License Agreements | 51,448,000 | ||||
Licensing Agreements [Member] | Fair Value, Measurements, Nonrecurring [Member] | |||||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
Assets, Fair Value Disclosure | $ 46,299,000 |