Fair Value Measurement (Narrative) (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Feature Film Production Assets [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset impairment charges	$ 160,000	$ 198,000
Fair value of assets	0
Long-Lived Property And Equipment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset impairment charges	0	$ 0
Equity Method Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset impairment charges	8,828,000
Equity Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset impairment charges	$ 2,715,000

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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