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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Dec. 29, 2013
Consolidated Statements of Stockholders' Equity      
Income attributable to noncontrolling interests $ 6,282 $ 4,382 $ 3,442
Accumulated other comprehensive income (1,836) 671 2,463
Unrealized foreign currency translation gains (losses) (411) 933 2,561
Net unrealized gain (loss) on the interest rate swap agreements $ (1,425) $ (262) $ (98)