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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 413,325 | $ 405,301 | $ 1,191,380 | $ 1,213,932
Energy and related sales, net | 1,236 | 1,346 | 3,346 | 4,013
Total revenues | 414,561 | 406,647 | 1,194,726 | 1,217,945
Costs of products sold | 359,826 | 345,477 | 1,052,626 | 1,056,209
Gross profit | 54,735 | 61,170 | 142,100 | 161,736
Selling, general and administrative expenses | 33,399 | 35,747 | 100,484 | 104,796
(Gains) losses on dispositions of plant, equipment and timberlands, net | (24) | 5 | (50) | 31
Operating income | 21,360 | 25,418 | 41,666 | 56,909
Other non-operating income (expense) |  |  |  |
Interest expense | (4,547) | (3,895) | (13,031) | (11,964)
Interest income | 51 | 52 | 209 | 204
Other, net | (478) | (573) | (906) | (956)
Total non-operating expense | (4,974) | (4,416) | (13,728) | (12,716)
Income before income taxes | 16,386 | 21,002 | 27,938 | 44,193
Income tax provision (benefit) | 4,281 | 1,401 | 9,944 | 6,459
Net income | 12,105 | 19,601 | 17,994 | 37,734
Other comprehensive income (loss) | 17,330 | (69) | 50,855 | 4,134
Comprehensive income | 29,435 | 19,532 | 68,849 | 41,868
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 203,205 | 211,761 | 600,346 | 638,918
Energy and related sales, net | 1,236 | 1,346 | 3,346 | 4,013
Total revenues | 204,441 | 213,107 | 603,692 | 642,931
Costs of products sold | 188,677 | 186,297 | 568,067 | 582,751
Gross profit | 15,764 | 26,810 | 35,625 | 60,180
Selling, general and administrative expenses | 18,730 | 21,048 | 55,976 | 62,115
(Gains) losses on dispositions of plant, equipment and timberlands, net | 70 | 7 | 118 | 11
Operating income | (3,036) | 5,755 | (20,469) | (1,946)
Other non-operating income (expense) |  |  |  |
Interest expense | (5,241) | (4,332) | (15,084) | (13,036)
Interest income | 160 | 173 | 451 | 523
Equity in earnings of subsidiaries | 17,880 | 17,228 | 50,298 | 46,485
Other, net | 498 | (670) | 1,525 | (1,787)
Total non-operating expense | 13,297 | 12,399 | 37,190 | 32,185
Income before income taxes | 10,261 | 18,154 | 16,721 | 30,239
Income tax provision (benefit) | (1,844) | (1,447) | (1,273) | (7,495)
Net income | 12,105 | 19,601 | 17,994 | 37,734
Other comprehensive income (loss) | 17,330 | (69) | 50,855 | 4,134
Comprehensive income | 29,435 | 19,532 | 68,849 | 41,868
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 20,588 | 18,086 | 63,173 | 54,293
Total revenues | 20,588 | 18,086 | 63,173 | 54,293
Costs of products sold | 19,525 | 16,732 | 60,158 | 51,493
Gross profit | 1,063 | 1,354 | 3,015 | 2,800
Selling, general and administrative expenses | 536 | (25) | 846 | (246)
(Gains) losses on dispositions of plant, equipment and timberlands, net | (114) |  | (188) |
Operating income | 641 | 1,379 | 2,357 | 3,046
Other non-operating income (expense) |  |  |  |
Interest expense | (300) | (1) | (619) | (1)
Interest income | 1,316 | 1,063 | 3,714 | 3,056
Equity in earnings of subsidiaries | 18,096 | 16,225 | 51,197 | 44,050
Other, net | (1,920) | (819) | (6,445) | (2,220)
Total non-operating expense | 17,192 | 16,468 | 47,847 | 44,885
Income before income taxes | 17,833 | 17,847 | 50,204 | 47,931
Income tax provision (benefit) | (47) | 619 | (94) | 1,446
Net income | 17,880 | 17,228 | 50,298 | 46,485
Other comprehensive income (loss) | 14,812 | (2,307) | 43,878 | (2,691)
Comprehensive income | 32,692 | 14,921 | 94,176 | 43,794
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 211,331 | 192,214 | 591,926 | 573,355
Total revenues | 211,331 | 192,214 | 591,926 | 573,355
Costs of products sold | 173,423 | 159,208 | 488,466 | 474,599
Gross profit | 37,908 | 33,006 | 103,460 | 98,756
Selling, general and administrative expenses | 14,133 | 14,724 | 43,662 | 42,927
(Gains) losses on dispositions of plant, equipment and timberlands, net | 20 | (2) | 20 | 20
Operating income | 23,755 | 18,284 | 59,778 | 55,809
Other non-operating income (expense) |  |  |  |
Interest expense | (436) | (751) | (1,377) | (2,352)
Interest income | 5 | 5 | 93 | 50
Other, net | 944 | 916 | 4,014 | 3,051
Total non-operating expense | 513 | 170 | 2,730 | 749
Income before income taxes | 24,268 | 18,454 | 62,508 | 56,558
Income tax provision (benefit) | 6,172 | 2,229 | 11,311 | 12,508
Net income | 18,096 | 16,225 | 51,197 | 44,050
Other comprehensive income (loss) | 14,959 | (2,462) | 43,344 | (2,835)
Comprehensive income | 33,055 | 13,763 | 94,541 | 41,215
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | (21,799) | (16,760) | (64,065) | (52,634)
Total revenues | (21,799) | (16,760) | (64,065) | (52,634)
Costs of products sold | (21,799) | (16,760) | (64,065) | (52,634)
Other non-operating income (expense) |  |  |  |
Interest expense | 1,430 | 1,189 | 4,049 | 3,425
Interest income | (1,430) | (1,189) | (4,049) | (3,425)
Equity in earnings of subsidiaries | (35,976) | (33,453) | (101,495) | (90,535)
Total non-operating expense | (35,976) | (33,453) | (101,495) | (90,535)
Income before income taxes | (35,976) | (33,453) | (101,495) | (90,535)
Net income | (35,976) | (33,453) | (101,495) | (90,535)
Other comprehensive income (loss) | (29,771) | 4,769 | (87,222) | 5,526
Comprehensive income | $ (65,747) | $ (28,684) | $ (188,717) | $ (85,009)

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