Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 3,040	$ (9,030)	$ 83,746
Deferred tax asset, valuation allowance	1,238	1,240
Release valuation allowance			141,100
Decrease in uncertain tax liabilities	17,100
Accrued interest and penalties to income tax (benefit) expense	12,700
Uncertain tax positions	5,292	9,788	9,866
Decrease in deferred tax asset	(3,300)
Expense from reversal of indemnification receivable	13,800
Total liabilities for uncertain tax positions including interest and penalties	27,000	40,200
Interest accruals	20,700	28,200
Penalty accruals	1,000	2,200
Income tax expense (benefit) of uncertain tax positions	13,156	(3,227)	(3,128)
Tax indemnification receivable	18,900	29,500
Tax indemnification expense (income), net	(10,635)	2,855	8,367
BMS
Operating Loss Carryforwards [Line Items]
Increase in amount due from BMS included within other long-term assets	3,200	3,300	8,400
Canada
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)		$ 4,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers	174,000
Tax indemnification expense (income), net			$ 6,500
Federal | 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers	1,400
State Research Credit
Operating Loss Carryforwards [Line Items]
Tax credits	3,000
Investment Tax Credit Carryforward | Massachusetts
Operating Loss Carryforwards [Line Items]
Tax credits	2,100
Net operating loss carryovers without expiration date	700
Settlement with Taxing Authority
Operating Loss Carryforwards [Line Items]
Accrued interest and penalties to income tax (benefit) expense	1,400
Uncertain tax positions	1,900
Change In Estimate
Operating Loss Carryforwards [Line Items]
Uncertain tax positions	$ 15,200