Value of stock issued to shareholders as a dividend during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_StockIssuedDuringPeriodValueStockDividend
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Earnings Per Share Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 29, 2015	Sep. 26, 2014	Sep. 27, 2013
Class of Stock [Line Items]
Effect of stock dividend	$ 0	$ 0	$ 0
Dividend equivalent rights	5,566	4,612	4,007
Tax on payments of dividend equivalent rights	211	306	91
Common Stock
Class of Stock [Line Items]
Stock dividend paid to company stockholders				5.00%	5.00%	5.00%
Effect of stock dividend	$ 584	$ 520	$ 450
Increase in number of shares subject to outstanding stock options	5.00%	5.00%	5.00%