Restructuring - Summary of Accruals of Restructuring Programs (Details) - USD ($) $ in Thousands		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019
Contractual Lease Obligations
Restructuring Reserve [Roll Forward]
Balance at January 1, 2019	$ 8,472	$ 8,472
Restructuring Charges		0
Payments		0
Balance at September 30, 2019		0
Severance
Restructuring Reserve [Roll Forward]
Balance at January 1, 2019	651	651
Restructuring Charges		3,368
Payments		(2,902)
Balance at September 30, 2019		1,117
Accounting Standards Update 2016-02 | Contractual Lease Obligations
Restructuring Reserve [Roll Forward]
Balance at January 1, 2019	0	0
Topic 842 Transition Adjustment	(8,472)
Accounting Standards Update 2016-02 | Severance
Restructuring Reserve [Roll Forward]
Balance at January 1, 2019	651	$ 651
Topic 842 Transition Adjustment	$ 0