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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Statement of Partners' Capital [Abstract]    
Net income, as reported $ 5,280 $ 8,355
Other comprehensive income (loss), net of tax:    
Unrealized gains/(losses) on investments, net of tax (136) 12
Total comprehensive income $ 5,144 $ 8,367