Impairment and Related Charges (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Impairment and related charges	$ 106,603	$ 4,486	$ 28,148
Impairment charge	97,996
impairments of intangibles and property and equipment associated with the sale of a subsidiary	8,600
Impairment and related charges	106,603	4,486	17,112
AMCNI Reporting Unit [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment and related charges		$ 4,500
Impairment charge	$ 98,000
Pre-tax loss on sale of business			11,000
Impairment and related charges			$ 17,100

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.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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