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Restructuring and Related Charges - Restructuring liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of restructuring liability
Beginning balance			$ 20,887	$ 8,781
Restructuring and other charges	$ 200	$ 13,100	2,334	13,088
Payments			(7,841)	(2,508)
Adjustments			(6,540)	107
Ending balance	8,840	19,468	8,840	19,468
Accounts payable and accrued expenses
Schedule of restructuring liability
Restructuring liabilities	6,200		6,200		$ 9,800
Lease and Related Costs, Net
Schedule of restructuring liability
Beginning balance			6,540	8,781
Restructuring and other charges			0	0
Payments			0	(2,069)
Adjustments			(6,540)	107
Ending balance	0	6,819	0	6,819
Severance and Other Employee Separation Costs
Schedule of restructuring liability
Beginning balance			14,347	0
Restructuring and other charges			2,334	13,088
Payments			(7,841)	(439)
Adjustments			0	0
Ending balance	$ 8,840	$ 12,649	$ 8,840	$ 12,649