Restructuring and Related Charges - Restructuring liability (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of restructuring liability
Beginning balance			$ 20,887,000	$ 8,781,000
Restructuring and other charges	$ 200,000	$ 0	2,086,000	0
Payments			(5,764,000)	(1,401,000)
Adjustments			(6,540,000)	74,000
Ending balance	10,669,000	7,454,000	10,669,000	7,454,000
Accounts payable and accrued expenses
Schedule of restructuring liability
Restructuring liabilities	6,800,000		6,800,000		$ 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	(1,401,000)
Adjustments			(6,540,000)	74,000
Ending balance	0	7,454,000	0	7,454,000
Severance and Other Employee Separation Costs
Schedule of restructuring liability
Beginning balance			14,347,000	0
Restructuring and other charges			2,086,000	0
Payments			(5,764,000)	0
Adjustments			0	0
Ending balance	$ 10,669,000	$ 0	$ 10,669,000	$ 0