Restructuring - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 17, 2019 USD ($) Employee	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring, expected number of positions eliminated | Employee	300
Restructuring, remaining number of positions after elimination | Employee	400
Restructuring expense		$ 811	$ 0	$ 7,442	$ 0
Accrued restructuring balance		381		381
Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring, expected pre-tax earnings	$ 8,000
Restructuring, expected percent non-cash	15.00%
Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring, expected pre-tax earnings	$ 10,000
Restructuring, expected percent non-cash	25.00%
Facility Closing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense		$ 363		$ 677