Restructuring and Related Charges - Restructuring liability (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of restructuring liability
Beginning balance	$ 20,887,000	$ 8,781,000
Restructuring and other charges	1,913,000	0
Payments	(2,424,000)	(724,000)
Adjustments	(6,540,000)	41,000
Ending balance	13,836,000	8,098,000
Accounts payable and accrued expenses
Schedule of restructuring liability
Restructuring liabilities	8,400,000		$ 9,800,000
Lease and Related Costs, Net
Schedule of restructuring liability
Beginning balance	6,540,000	8,781,000
Restructuring and other charges	0	0
Payments	0	(724,000)
Adjustments	(6,540,000)	41,000
Ending balance	0	8,098,000
Severance and Other Employee Separation Costs
Schedule of restructuring liability
Beginning balance	14,347,000	0
Restructuring and other charges	1,913,000	0
Payments	(2,424,000)	0
Adjustments	0	0
Ending balance	$ 13,836,000	$ 0