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CONDENSED CONSOLIDATED AND COMBINED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Sales $ 361,441 $ 308,418 $ 738,145 $ 608,248
Costs, expenses and other:        
Costs of goods sold 299,519 273,820 613,636 519,379
Selling, general and administrative expenses 18,131 10,876 34,937 22,254
Other non-operating, net 2,708 (499) 4,248 (1,157)
Costs, expenses and other 320,358 284,197 652,821 540,476
Income before taxes 41,083 24,221 85,324 67,772
Income taxes 15,317 9,213 32,265 25,370
Net income $ 25,766 $ 15,008 $ 53,059 $ 42,402
Earnings per common share        
Basic (in dollars per share) $ 0.85 $ 0.49 $ 1.74 $ 1.39
Diluted (in dollars per share) $ 0.83 $ 0.49 $ 1.71 $ 1.39
Weighted average common shares outstanding        
Basic (in shares) 30,482,966 30,482,966 30,482,966 30,482,966
Diluted (in shares) 30,986,854 30,482,966 30,977,472 30,482,966