Reorganization and Realignment Costs Summary (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Apr. 01, 2018
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 798	$ 2,626
G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Reorganization and realignment costs	782	2,626
Restructuring and Related Cost, Expected Cost Remaining	3,500
System Optimization
Restructuring Cost and Reserve
Reorganization and realignment costs	16	$ 0
Restructuring and Related Cost, Expected Cost Remaining	$ 500

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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