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Financial instruments Aggregate accounts receivable, net of allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 27, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts receivable $ 8,400 $ 8,000
Spain, Italy, Portugal, and Greece    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts receivable 7,300 7,200
Current and long-term accounts receivable (net of allowances of $7.3 million and $7.2 million at March 27, 2016 and December 31, 2015, respectively) in Greece, Italy, Spain and Portugal (1) $ 70,343 $ 62,272
Percentage of total net current and long-term accounts receivable - Greece, Italy, Spain and Portugal 25.60% 23.90%
Long-term portion of accounts receivable, net $ 9,600 $ 8,100