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Restructuring Activities - Schedule of Restructuring Related Costs (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Aug. 10, 2018	Dec. 14, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Charges			$ 3,055	$ 3,142	$ 10,687	$ 3,142
Restructuring Plan, 2018
Restructuring Reserve [Roll Forward]
Beginning balance					1,349
Charges					10,687
Cash payments					(9,073)
Non-cash settlements/adjustments	$ (400)				(112)
Ending balance			2,851		2,851
Restructuring Plan, 2018 \| Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Beginning balance					357
Charges					4,434
Cash payments					(3,217)
Non-cash settlements/adjustments					55
Ending balance			1,629		1,629
Restructuring Plan, 2018 \| Lease and Contract Termination Costs
Restructuring Reserve [Roll Forward]
Beginning balance					286
Charges					851
Cash payments					(888)
Non-cash settlements/adjustments					(167)
Ending balance			82		82
Restructuring Plan, 2018 \| Other
Restructuring Reserve [Roll Forward]
Beginning balance					706
Charges					5,402
Cash payments					(4,968)
Non-cash settlements/adjustments					0
Ending balance			1,140		1,140
Restructuring Plan, 2015
Restructuring Reserve [Roll Forward]
Beginning balance					486
Charges		$ 6,700
Cash payments					(364)
Ending balance			122		122
Restructuring Plan, 2015 \| Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Beginning balance					486
Charges		5,600
Cash payments					(364)
Ending balance			122		122
Restructuring Plan, 2015 \| Lease and Contract Termination Costs
Restructuring Reserve [Roll Forward]
Beginning balance					0
Charges		$ 1,100
Cash payments					0
Ending balance			0		0
Restructuring Plan, 2015 \| Other
Restructuring Reserve [Roll Forward]
Beginning balance					0
Cash payments					0
Ending balance			$ 0		$ 0