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Condensed Consolidated Statements of Comprehensive Income Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 24, 2014
Sep. 30, 2015
Sep. 24, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 8,950 $ 8,343 $ 27,217 $ 23,047
Other comprehensive (loss) income, net of tax:        
Minimum pension liability adjustment, net of tax expense of $169, $90, $507 and $271 265 141 793 422
Recognition of unrealized (loss) gain on hedge transactions, net of tax (benefit) expense of $(2,266), $103, $(1,303) and $(460) (3,542) 159 (2,037) (718)
Other comprehensive (loss) income (3,277) 300 (1,244) (296)
Total comprehensive income $ 5,673 $ 8,643 $ 25,973 $ 22,751