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14. Segment Information Segment Information by Geographical Location (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Net sales $ 621,300 $ 534,100 $ 504,700 $ 500,100 $ 571,500 $ 508,700 $ 516,800 $ 471,200 $ 2,160,153 $ 2,068,172 $ 2,019,441
Other assets and property, plant and equipment, net 1,567,300       1,334,200       1,567,300 1,334,200  
Europe [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 758,500 742,200 763,700
Other assets and property, plant and equipment, net 230,600       221,100       230,600 221,100  
Pacific Rim [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 461,300 427,100 392,200
Other assets and property, plant and equipment, net 18,400       16,100       18,400 16,100  
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Net sales                 800,200 770,600 735,000
Other assets and property, plant and equipment, net 1,305,200       1,084,700       1,305,200 1,084,700  
Other (primarily Canada and Latin America) [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 140,200 128,300 $ 128,500
Other assets and property, plant and equipment, net $ 13,100       $ 12,300       $ 13,100 $ 12,300