Restructuring - Summary of Accruals of Restructuring Programs (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Expenses, Net		$ 13,281	$ 906
Contractual Lease Obligations
Restructuring Reserve [Roll Forward]
Balance at January 1, 2019	$ 8,472	8,472
Restructuring Charges		0
Payments		0
Balance at March 31, 2019		0
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Expenses, Net		1,136	$ 514
Restructuring Reserve [Roll Forward]
Balance at January 1, 2019	651	651
Restructuring Charges		1,136
Payments		(1,033)
Balance at March 31, 2019		754
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