Restructuring Activities - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Beginning balance:	$ 2,816	$ 2,816	$ 2,407	$ 0
Additions:	2,235	5,055
Payments	(1,826)	(2,239)
Ending balance:	2,816	2,816
Contract termination fee
Restructuring Reserve [Roll Forward]
Beginning balance:	2,067	2,067	2,100	0
Additions:	667	2,767
Payments	(700)	(700)
Ending balance:	2,067	2,067
Severance
Restructuring Reserve [Roll Forward]
Beginning balance:	608	608	231	0
Additions:	1,116	1,760
Payments	(739)	(1,152)
Ending balance:	608	608
Facility, asset impairment and other expense
Restructuring Reserve [Roll Forward]
Beginning balance:	141	141	$ 76	$ 0
Additions:	452	528
Payments	(387)	(387)
Ending balance:	$ 141	$ 141