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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Net sales $ 406,413 $ 410,803 $ 808,631 $ 828,272
Energy and related sales, net 2,001 715 2,667 2,783
Total revenues 408,414 411,518 811,298 831,055
Costs of products sold 365,691 378,685 710,732 746,114
Gross profit 42,723 32,833 100,566 84,941
Selling, general and administrative expenses 37,191 29,137 69,049 60,409
(Gains) losses on dispositions of plant, equipment and timberlands, net 2 (111) 26 (2,765)
Operating income 5,530 3,807 31,491 27,297
Non-operating income (expense)        
Interest expense (3,953) (4,352) (8,069) (8,860)
Interest income 61 77 152 142
Other, net 317 215 (383) 28
Total non-operating expense (3,575) (4,060) (8,300) (8,690)
Income (loss) before income taxes 1,955 (253) 23,191 18,607
Income tax (benefit) provision (10) (3,101) 5,058 1,834
Net income $ 1,965 $ 2,848 $ 18,133 $ 16,773
Earnings per share        
Basic $ 0.05 $ 0.07 $ 0.42 $ 0.39
Diluted 0.04 0.06 0.41 0.38
Cash dividends declared per common share $ 0.125 $ 0.120 $ 0.250 $ 0.240
Weighted average shares outstanding        
Basic 43,558 43,377 43,539 43,315
Diluted 44,062 44,032 43,963 43,992