The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Feb. 28, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Reduction in carrying amount of goodwill	$ 672
Additions	$ 18,260
Equity method investment, ownership percentage	50.00%		50.00%
Aggregate amortization expense for amortizable intangible assets	$ 18,900	$ 23,100
Domestic Operations
Finite-Lived Intangible Assets [Line Items]
Reduction in carrying amount of goodwill	672
Additions	0
International & Other
Finite-Lived Intangible Assets [Line Items]
Accumulated impairment charges	123,100			$ 123,100
Reduction in carrying amount of goodwill	0
Additions	$ 18,260