Restructuring (Details) - USD ($)	12 Months Ended			27 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 30, 2021	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 3,792,000	$ 52,372,000	$ 4,130,000	$ 56,164,000
Restructuring Reserve	8,394,000	23,265,000	3,245,000		$ 1,286,000
Early Termination Agreement Payment	11,700,000
Lease Liability Associated with Surrendered Office	17,400,000
Gain on Early Termination Agreement	5,700,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	183,000	(32,780,000)	(4,130,000)	32,597,000
Restructuring Reserve	8,394,000	22,312,000	3,245,000		$ 1,269,000
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(224,000)	4,019,000		3,795,000
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	62,000	1,354,000		$ 1,416,000
Employee-related Liabilities, Current
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,900,000	7,200,000
Accrued salaries and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3,600,000	11,300,000
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 200,000	$ 4,000,000	100,000
Corporate Segment [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			28,000
Corporate Segment [Member] | Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 28,000