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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 405,301 | $ 419,960 | $ 1,213,932 | $ 1,248,232
Energy and related sales, net | 1,346 | 1,153 | 4,013 | 3,936
Total revenues | 406,647 | 421,113 | 1,217,945 | 1,252,168
Costs of products sold | 345,477 | 361,205 | 1,056,209 | 1,107,319
Gross profit | 61,170 | 59,908 | 161,736 | 144,849
Selling, general and administrative expenses | 35,747 | 39,792 | 104,796 | 100,201
Losses (gains) on dispositions of plant, equipment and timberlands, net | 5 | (123) | 31 | (2,888)
Operating income | 25,418 | 20,239 | 56,909 | 47,536
Other non-operating income (expense) |  |  |  |
Interest expense | (3,895) | (4,317) | (11,964) | (13,177)
Interest income | 52 | 90 | 204 | 232
Other, net | (573) | (220) | (956) | (192)
Total non-operating expense | (4,416) | (4,447) | (12,716) | (13,137)
Income before income taxes | 21,002 | 15,792 | 44,193 | 34,399
Income tax provision (benefit) | 1,401 | 2,288 | 6,459 | 4,122
Net income | 19,601 | 13,504 | 37,734 | 30,277
Other comprehensive income (loss) | (69) | (3,002) | 4,134 | (21,200)
Comprehensive income | 19,532 | 10,502 | 41,868 | 9,077
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | (16,760) | (19,437) | (52,634) | (59,655)
Total revenues | (16,760) | (19,437) | (52,634) | (59,655)
Costs of products sold | (16,760) | (19,437) | (52,634) | (59,655)
Other non-operating income (expense) |  |  |  |
Interest expense | 1,189 | 23,230 | 3,425 | 36,559
Interest income | (1,189) | (23,231) | (3,425) | (36,559)
Equity in earnings of subsidiaries | (33,453) | (4,808) | (90,535) | (60,654)
Total non-operating expense | (33,453) | (4,809) | (90,535) | (60,654)
Income before income taxes | (33,453) | (4,809) | (90,535) | (60,654)
Net income | (33,453) | (4,809) | (90,535) | (60,654)
Other comprehensive income (loss) | 4,769 | 13,706 | 5,526 | 9,451
Comprehensive income | (28,684) | 8,897 | (85,009) | (51,203)
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 211,761 | 222,803 | 638,918 | 655,599
Energy and related sales, net | 1,346 | 1,153 | 4,013 | 3,936
Total revenues | 213,107 | 223,956 | 642,931 | 659,535
Costs of products sold | 186,297 | 197,906 | 582,751 | 614,060
Gross profit | 26,810 | 26,050 | 60,180 | 45,475
Selling, general and administrative expenses | 21,048 | 24,764 | 62,115 | 57,607
Losses (gains) on dispositions of plant, equipment and timberlands, net | 7 | (4) | 11 | (1,526)
Operating income | 5,755 | 1,290 | (1,946) | (10,606)
Other non-operating income (expense) |  |  |  |
Interest expense | (4,332) | (4,346) | (13,036) | (13,771)
Interest income | 173 | 181 | 523 | 513
Equity in earnings of subsidiaries | 17,228 | 14,173 | 46,485 | 48,775
Other, net | (670) | (961) | (1,787) | (2,423)
Total non-operating expense | 12,399 | 9,047 | 32,185 | 33,094
Income before income taxes | 18,154 | 10,337 | 30,239 | 22,488
Income tax provision (benefit) | (1,447) | (3,167) | (7,495) | (7,789)
Net income | 19,601 | 13,504 | 37,734 | 30,277
Other comprehensive income (loss) | (69) | (3,002) | 4,134 | (21,200)
Comprehensive income | 19,532 | 10,502 | 41,868 | 9,077
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 18,086 | 19,005 | 54,293 | 61,822
Total revenues | 18,086 | 19,005 | 54,293 | 61,822
Costs of products sold | 16,732 | 17,299 | 51,493 | 58,554
Gross profit | 1,354 | 1,706 | 2,800 | 3,268
Selling, general and administrative expenses | (25) | (8) | (246) | 947
Losses (gains) on dispositions of plant, equipment and timberlands, net |  |  |  | (1,183)
Operating income | 1,379 | 1,714 | 3,046 | 3,504
Other non-operating income (expense) |  |  |  |
Interest expense | (1) |  | (1) |
Interest income | 1,063 | 23,129 | 3,056 | 36,226
Equity in earnings of subsidiaries | 16,225 | (9,366) | 44,050 | 11,879
Other, net | (819) | 23 | (2,220) | (136)
Total non-operating expense | 16,468 | 13,786 | 44,885 | 47,969
Income before income taxes | 17,847 | 15,500 | 47,931 | 51,473
Income tax provision (benefit) | 619 | 1,270 | 1,446 | 2,586
Net income | 17,228 | 14,230 | 46,485 | 48,887
Other comprehensive income (loss) | (2,307) | (5,954) | (2,691) | (30,607)
Comprehensive income | 14,921 | 8,276 | 43,794 | 18,280
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 192,214 | 197,589 | 573,355 | 590,466
Total revenues | 192,214 | 197,589 | 573,355 | 590,466
Costs of products sold | 159,208 | 165,437 | 474,599 | 494,360
Gross profit | 33,006 | 32,152 | 98,756 | 96,106
Selling, general and administrative expenses | 14,724 | 15,036 | 42,927 | 41,647
Losses (gains) on dispositions of plant, equipment and timberlands, net | (2) | (119) | 20 | (179)
Operating income | 18,284 | 17,235 | 55,809 | 54,638
Other non-operating income (expense) |  |  |  |
Interest expense | (751) | (23,201) | (2,352) | (35,965)
Interest income | 5 | 11 | 50 | 52
Other, net | 916 | 718 | 3,051 | 2,367
Total non-operating expense | 170 | (22,472) | 749 | (33,546)
Income before income taxes | 18,454 | (5,237) | 56,558 | 21,092
Income tax provision (benefit) | 2,229 | 4,185 | 12,508 | 9,325
Net income | 16,225 | (9,422) | 44,050 | 11,767
Other comprehensive income (loss) | (2,462) | (7,752) | (2,835) | 21,156
Comprehensive income | $ 13,763 | $ (17,174) | $ 41,215 | $ 32,923

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