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16. Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quantifying Misstatement in Current Year Financial Statements [Line Items]                      
Net sales $ 616,900 $ 545,100 $ 575,900 $ 551,500 $ 621,300 $ 534,100 $ 504,700 $ 500,100 $ 2,289,415 $ 2,160,153 $ 2,068,172
Operating Income (Loss)                 (103,341) 119,250 55,718
Cost of Goods and Services Sold                 1,066,264 972,450 929,744
Gross profit 332,600 286,700 301,700 302,200 345,200 299,000 273,400 270,100 1,223,151 1,187,703 1,138,428
Selling, general and administrative expense                 834,783 806,790 814,697
Research and development expense                 199,196 250,157 205,708
Unrealized Loss on Securities 814,100                    
Net Income (Loss) Attributable to Parent $ (828,500) $ 269,300 $ 268,000 $ 656,800 $ 82,700 $ 22,100 $ 5,000 $ 12,400 $ 365,614 $ 122,249 $ 26,000
Earnings Per Share, Basic $ (27.73) $ 9.02 $ 8.99 $ 22.05 $ 2.78 $ 0.74 $ 0.17 $ 0.42 $ 12.25 $ 4.12 $ 0.88
Earnings Per Share, Diluted $ (27.73) $ 8.89 $ 8.87 $ 21.77 $ 2.75 $ 0.73 $ 0.17 $ 0.41 $ 12.10 $ 4.07 $ 0.88
Income Tax Expense (Benefit)                 $ (147,045) $ 24,444 $ (15,560)
Impairment losses on goodwill and long-lived assets $ 292,500               $ 292,513 $ 11,506 $ 62,305