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Restructuring Activities - Narrative (Details)	3 Months Ended	9 Months Ended	12 Months Ended
Restructuring Activities - Narrative (Details)	Mar. 31, 2017 USD ($)	Sep. 30, 2019 People	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges			$ 26,678,000	$ 0	$ 0
Two Zero One Five Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Cost Remaining						$ 700,000
Restructuring, Cash Payments	$ 700,000				$ 0
QH Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges			26,678,000
Restructuring And Related Cost Expected Number Of Positions Eliminated \| People		275
Restructuring, Cash Payments			$ 8,899,000