Restructuring - Additional Information (Details) $ in Thousands		3 Months Ended
	Jan. 17, 2019 Employee	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
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		$ 4,973	$ 0
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		5.00%
Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring, expected pre-tax earnings		$ 11,000
Restructuring, expected percent non-cash		10.00%
Severance and employee-related costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense		$ 4,163
Accrued restructuring balance		4,163
Asset write-downs and other costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense		$ 810