Quarterly Financial Information (Unaudited) - Components of Gross Profit and Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Gross profit impact of inventory step-up purchase accounting adjustments	$ 585	$ 1,390	$ 0	$ 0	$ 0	$ 83	$ 543	$ 481
Gross profit impact of restructuring, severance, and segment consolidation expenses	169	400	876	449	155	287	92	441
Net income impact of inventory step-up purchase accounting adjustments	438	1,077	0	0	0	59	394	350
Net income impact of restructuring, severance, and segment consolidation expenses	527	409	711	494	488	910	216	702
Net income impact of long-lived asset impairment charges	0	0	0	0	0	0	0	490
Net income impact of strategic initiatives expenses	493	1,730	923	87	205	219	0	125
Net income impact of discrete tax items	$ 320	$ 0	$ 0	$ 0	$ (2,867)	$ (1,380)	$ 0	$ 0