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1. Significant Accounting Policies Significant Accounting Policies Reclassification & Correction of Immaterial Errors (Details) - USD ($)
$ / shares in Units, $ 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
Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income Tax Expense (Benefit) $ 36,800 $ (8,600) $ 3,900 $ (7,700) $ 9,500 $ (5,600) $ (10,300) $ (9,200) $ 24,444 $ (15,560) $ (36,608)  
Buildings and leasehold improvements 315,984       300,834       315,984 300,834    
Machinery and Equipment, Gross 971,140       908,659       971,140 908,659    
Deferred income taxes 222,209       225,299       222,209 225,299    
Other long-term liabilities 183,276       140,537       183,276 140,537    
Liabilities 1,342,762       1,271,344       1,342,762 1,271,344    
Retained earnings 1,830,439       1,828,581       1,830,439 1,828,581    
Stockholders' Equity Attributable to Parent 2,930,250       2,579,160       2,930,250 2,579,160 2,485,029 $ 2,183,535
Net Income (Loss) Attributable to Parent $ 82,700 $ 22,100 $ 5,000 $ 12,400 $ (18,700) $ 17,100 $ 16,600 $ 11,000 $ 122,249 $ 26,000 $ 109,239  
Earnings Per Share, Basic $ 2.78 $ 0.74 $ 0.17 $ 0.42 $ (0.63) $ 0.58 $ 0.56 $ 0.38 $ 4.12 $ 0.88 $ 3.74  
Earnings Per Share, Diluted $ 2.75 $ 0.73 $ 0.17 $ 0.41 $ (0.63) $ 0.58 $ 0.56 $ 0.37 $ 4.07 $ 0.88 $ 3.71  
Scenario, Previously Reported [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income Tax Expense (Benefit) $ 32,200 $ (11,500) $ 3,900 $ (7,700) $ 7,600 $ (4,300) $ (8,900) $ (7,900)   $ (13,435) $ (32,754)  
Buildings and leasehold improvements         290,367         290,367    
Machinery and Equipment, Gross         919,126         919,126    
Deferred income taxes         222,919         222,919    
Other long-term liabilities         135,318         135,318    
Liabilities         1,263,745         1,263,745    
Retained earnings         1,836,180         1,836,180    
Stockholders' Equity Attributable to Parent         2,586,759         2,586,759    
Net Income (Loss) Attributable to Parent $ 69,900 $ 27,400 $ 5,000 $ 12,400 $ (20,600) $ 18,400 $ 18,000 $ 12,300   $ 28,125 $ 113,093  
Earnings Per Share, Basic $ 2.35 $ 0.92 $ 0.17 $ 0.42 $ (0.70) $ 0.63 $ 0.61 $ 0.42   $ 0.96 $ 3.87  
Earnings Per Share, Diluted $ 2.32 $ 0.91 $ 0.17 $ 0.41 $ (0.70) $ 0.62 $ 0.61 $ 0.42   $ 0.95 $ 3.85  
Scenario, Adjustment [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income Tax Expense (Benefit) $ 4,600 $ 2,900 $ 0 $ 0 $ 1,900 $ (1,300) $ (1,400) $ (1,300)   $ (2,125) $ (3,854)  
Buildings and leasehold improvements         10,467         10,467    
Machinery and Equipment, Gross         (10,467)         (10,467)    
Deferred income taxes         2,380         2,380    
Other long-term liabilities         5,219         5,219    
Liabilities         7,599         7,599    
Retained earnings         (7,599)         (7,599) (200)  
Stockholders' Equity Attributable to Parent         (7,599)         (7,599)    
Net Income (Loss) Attributable to Parent $ 12,800 $ (5,300) $ 0 $ 0 $ 1,900 $ (1,300) $ (1,400) $ (1,300)   $ (2,125) $ (3,854)  
Earnings Per Share, Basic $ 0.43 $ (0.18) $ 0 $ 0 $ 0.07 $ (0.05) $ (0.05) $ (0.04)   $ (0.08) $ (0.13)  
Earnings Per Share, Diluted $ 0.43 $ (0.18) $ 0 $ 0 $ 0.07 $ (0.04) $ (0.05) $ (0.05)   $ (0.07) $ (0.14)  
Scenario, Adjustment [Member] | First Tax Misstatement [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income Tax Expense (Benefit)                     $ 2,400  
Scenario, Adjustment [Member] | Second Tax Misstatement [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income Tax Expense (Benefit)                   $ 1,900 1,300  
Other long-term liabilities         $ 4,600         4,600    
Retained earnings                     (1,400)  
Scenario, Adjustment [Member] | Third Tax Misstatement [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Income Tax Expense (Benefit)                   200 $ 181  
Other long-term liabilities         $ 600         $ 600