Restructuring - Restructuring Reserve Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	$ 1,602	$ 2,525	$ 0
Restructuring and other charges	16,966	290	3,537
Cash payments	(6,084)	(1,213)	(577)
Non-cash adjustments	(9,245)		(435)
Accrued liability, ending balance	3,239	1,602	2,525
2017 Restructuring | Property and equipment
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	0	0	0
Restructuring and other charges	8,233	0	0
Cash payments	(250)	0	0
Non-cash adjustments	(6,933)		0
Accrued liability, ending balance	1,050	0	0
2017 Restructuring | Employee costs
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	0	0	0
Restructuring and other charges	5,851	0	0
Cash payments	(4,658)	0	0
Non-cash adjustments	(814)		0
Accrued liability, ending balance	379	0	0
2017 Restructuring | Inventory
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	0	0	0
Restructuring and other charges	1,475	0	0
Cash payments	0	0	0
Non-cash adjustments	(1,475)		0
Accrued liability, ending balance	0	0	0
2017 Restructuring | Other costs
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	0	0	0
Restructuring and other charges	1,226	0	0
Cash payments	(786)	0	0
Non-cash adjustments	(23)		0
Accrued liability, ending balance	417	0	0
2015 Restructuring | Employee costs
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	0	466	0
Restructuring and other charges	0	61	1,043
Cash payments	0	(527)	(577)
Non-cash adjustments	0		0
Accrued liability, ending balance	0	0	466
2015 Restructuring | Other costs
Restructuring Reserve [Roll Forward]
Accrued liability, beginning balance	1,602	2,059	0
Restructuring and other charges	181	229	2,494
Cash payments	(390)	(686)	0
Non-cash adjustments	0		(435)
Accrued liability, ending balance	$ 1,393	$ 1,602	$ 2,059