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Step Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
company
Jun. 29, 2013
Jun. 28, 2014
Spanish Companies Acquisition [Member]
Mar. 29, 2014
Spanish Companies Acquisition [Member]
Jun. 28, 2014
Spanish Companies Acquisition [Member]
company
Spanish companies              
Number of Spanish companies     2       2
Ownership interest in Spanish companies (as a percent)         75.00% 50.00% 75.00%
Net loss related to acquired companies           $ 529  
Income Tax Expense (Benefit) 4,305 2,538 11,642 6,960   2,350  
Purchase of capital stock         $ 736