Restructuring Charges (Summary of Restructuring Costs) (Details) - Workforce Reduction Plan $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	$ 4,257
Accruals	682
Payments	4,626
Balance at the end of the period	313
Cumulative Charges Incurred	28,635
Termination benefits
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	4,257
Accruals	682
Payments	4,626
Balance at the end of the period	313
Cumulative Charges Incurred	$ 28,635