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Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 02, 2018
Jan. 01, 2018
Dec. 31, 2017
Balance Sheet [Abstract]              
Retained earnings $ 434,534,000   $ 434,534,000       $ 361,243,000
Receivables, trade 360,765,000   360,765,000   $ 247,952,000   246,452,000
Accrued liabilities, other 80,306,000   80,306,000   $ 57,286,000   $ 55,786,000
Income Statement [Abstract]              
Sales 1,408,132,000   2,590,973,000        
Materials, labor, and other operating expenses (excluding depreciation) 1,193,918,000 $ 980,210,000 2,203,696,000 $ 1,826,969,000      
Selling and distribution expenses 96,841,000 $ 82,308,000 180,197,000 $ 155,988,000      
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]              
Balance Sheet [Abstract]              
Receivables, trade 359,065,000   359,065,000        
Accrued liabilities, other 78,606,000   78,606,000        
Income Statement [Abstract]              
Sales 1,401,152,000   2,576,990,000        
Materials, labor, and other operating expenses (excluding depreciation) 1,187,376,000   2,190,509,000        
Selling and distribution expenses 96,403,000   179,401,000        
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]              
Balance Sheet [Abstract]              
Retained earnings           $ 0  
Receivables, trade 1,700,000   1,700,000     1,500,000  
Accrued liabilities, other 1,700,000   1,700,000     $ 1,500,000  
Income Statement [Abstract]              
Sales 6,980,000   13,983,000        
Materials, labor, and other operating expenses (excluding depreciation) 6,542,000   13,187,000        
Selling and distribution expenses $ 438,000   $ 796,000