Business Segment Information Business Segment Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended	48 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2022
Segment Reporting Information [Line Items]
Asset Write-Offs, Impairments, And Related Charges	$ 72,924	$ 211,791
Restructuring Charges	26,000	24,000
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	$ 26,000	$ 24,000
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member] | Subsequent Event [Member]
Segment Reporting Information [Line Items]
Restructuring Charges			$ 165,000	$ 205,000