Restructuring Charges - Summary of Changes (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Beginning balance January 1, 2020	$ 11,512,000
Accruals	5,547,000	$ 0	$ 12,000,000.0
Payments	4,232,000
Ending balance March 31, 2020	12,827,000		11,512,000
Cumulative Charges Incurred	17,573,000
Expected Additional Expenses to be Incurred	5,556,000
One-time Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning balance January 1, 2020	8,389,000
Accruals	761,000
Payments	1,824,000
Ending balance March 31, 2020	7,326,000		8,389,000
Cumulative Charges Incurred	9,641,000
Expected Additional Expenses to be Incurred	2,220,000
Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Beginning balance January 1, 2020	338,000
Accruals	0
Payments	0
Ending balance March 31, 2020	338,000		338,000
Cumulative Charges Incurred	338,000
Expected Additional Expenses to be Incurred	300,000
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Beginning balance January 1, 2020	2,785,000
Accruals	4,786,000
Payments	2,408,000
Ending balance March 31, 2020	5,163,000		$ 2,785,000
Cumulative Charges Incurred	7,594,000
Expected Additional Expenses to be Incurred	$ 3,036,000