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Restructuring Charges (Details) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 30, 2018 USD ($)
Restructuring and related costs, positions eliminated
Restructuring and other charges	$ 0	$ 0	$ 836	$ 1,374	$ 836	$ 836	$ 4,233	$ 4,089	$ 8,821	$ 2,217
2020 Plan
Restructuring and related costs, positions eliminated
Restructuring, number of positions eliminated								70
Restructuring and other charges								$ 3,300
Restructuring payments								900
Restructuring accrual								2,400
2019 Plan
Restructuring and related costs, positions eliminated
Restructuring, number of positions eliminated									80
Restructuring and other charges								$ 800	$ 8,800
2018 Plan
Restructuring and related costs, positions eliminated
Restructuring, number of positions eliminated										50
Assets held-for-sale										$ 3,500
2018 Plan | Restructuring and other charges
Restructuring and related costs, positions eliminated
Gain on disposal of assets held for sale										1,200
2018 Plan | Employee severance
Restructuring and related costs, positions eliminated
Restructuring and other charges										2,200
2018 Plan | Employee severance | Other
Restructuring and related costs, positions eliminated
Restructuring and other charges										2,000
2018 Plan | Employee severance | Corporate
Restructuring and related costs, positions eliminated
Restructuring and other charges										$ 200
2018 Plan | Minimum
Restructuring and related costs, positions eliminated
Company estimate of the aggregate restructuring cost											$ 2,000
2018 Plan | Maximum
Restructuring and related costs, positions eliminated
Company estimate of the aggregate restructuring cost											$ 5,000

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