Restructuring and Related Charges - Restructuring liability (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of restructuring liability
Beginning balance			$ 8,283,000	$ 20,887,000
Restructuring and other charges	$ 0	$ 200,000	0	2,086,000
Payments			(3,986,000)	(5,764,000)
Adjustments			0	(6,540,000)
Ending balance	4,297,000	10,669,000	4,297,000	10,669,000
Accounts payable and accrued expenses
Schedule of restructuring liability
Restructuring liabilities	3,900,000		3,900,000		$ 6,400,000
Lease and Related Costs, Net
Schedule of restructuring liability
Beginning balance			0	6,540,000
Restructuring and other charges			0	0
Payments			0	0
Adjustments			0	(6,540,000)
Ending balance	0	0	0	0
Severance and Other Employee Separation Costs
Schedule of restructuring liability
Beginning balance			8,283,000	14,347,000
Restructuring and other charges			0	2,086,000
Payments			(3,986,000)	(5,764,000)
Adjustments			0	0
Ending balance	$ 4,297,000	$ 10,669,000	$ 4,297,000	$ 10,669,000