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Revenue Impact of changes in accounting policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales $ 875,374 $ 878,510
Cost of sales and operating expenses 678,099 $ 687,966
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales 921,561  
Cost of sales and operating expenses 724,286  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales 46,187  
Cost of sales and operating expenses $ 46,187