Non-Qualified Deferred Compensation Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2014 employee		Dec. 31, 2013
Deferred compensation plan - marketable securities [Line Items]
Number of participants NQDC	127
Deferred Compensation Plan Assets	$ 85,282	[1]	$ 83,154	[1]
Level 1 [Member]
Deferred compensation plan - marketable securities [Line Items]
Deferred Compensation Plan Assets	84,217	[1]	81,848	[1]
Level 1 [Member] | Restricted cash equivalents [Member]
Deferred compensation plan - marketable securities [Line Items]
Deferred Compensation Plan Assets	19,636	[1]	16,699	[1]
Level 1 [Member] | Equity securities [Member]
Deferred compensation plan - marketable securities [Line Items]
Deferred Compensation Plan Assets	32,969	[1]	32,628	[1]
Level 1 [Member] | Mutual funds [Member]
Deferred compensation plan - marketable securities [Line Items]
Deferred Compensation Plan Assets	31,612	[1]	32,521	[1]
Level 2 [Member] | Fixed income securities [Member]
Deferred compensation plan - marketable securities [Line Items]
Deferred Compensation Plan Assets	$ 1,065	[1]	$ 1,306	[1]

[1] Included in Deferred compensation plan - marketable securities and Deferred compensation plan - restricted cash equivalents in the accompanying consolidated balance sheets as of March 28, 2014 and December 31, 2013.