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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings $ 97,339 $ 49,554 $ 55,983
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 104,990 91,090 84,732
Equity-based compensation expense 3,620 12,385 4,557
Deferred taxes (40,589) 18,327 16,081
Employee benefit plans (4,371) (1,979) 3,011
Deferred issuance costs on debt 1,199 1,242 928
Disposal of plant and equipment, net 4,053 1,381 1,492
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities 1,750 758 (1,020)
Changes in working capital, net of acquisition 21,761 (3,462) 14,841
Change in taxes receivable, net (10,573) 5,142 (13,596)
Excess tax benefits from equity-based payment arrangements 0 (312) (1,433)
Funding of qualified pension plans 0 0 (3,179)
Other, net (1,509) (1,375) (2,722)
Net cash flows from operating activities 177,670 172,751 159,675
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net 0 250 49,750
Additions to property, plant and equipment (199,748) (155,349) (128,902)
Payments to Acquire Businesses, Net of Cash Acquired 0 67,443 0
Proceeds from sale of assets 951 36 604
Net cash flows from investing activities (198,797) (222,506) (78,548)
CASH FLOWS FROM FINANCING ACTIVITIES      
Purchase of treasury stock (4,875) (65,327) (99,990)
Proceeds from Lines of Credit 298,308 1,273,959 0
Repayments of Lines of Credit (278,308) (1,138,959) 0
Payments for debt issuance costs 0 (1,906) 0
Payment of tax withholdings on equity-based payment arrangements (1,127) (933) (4,152)
Excess tax benefits from equity-based payment arrangements 0 312 1,433
Other, net (134) 0 (139)
Net cash flows from financing activities 13,864 67,146 (102,848)
(Decrease) increase in cash and cash equivalents (7,263) 17,391 (21,721)
Cash and cash equivalents at beginning of period 23,001 5,610 27,331
Cash and cash equivalents at end of period 15,738 23,001 5,610
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:      
Cash paid for interest, net of amounts capitalized 28,085 26,690 28,195
Cash paid for income taxes 2,684 17,655 35,849
Cash received from income tax refunds 7,638 11,289 2,533
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING ACTIVITIES:      
Changes in accrued property, plant and equipment (1,063) 328 5,202
Non-cash changes to plant, property, and equipment 4,241 0 0
Parent Company [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings 99,710 50,773 56,393
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 76,862 68,496 65,078
Equity-based compensation expense 3,620 12,385 4,557
Deferred taxes (16,957) 18,860 9,944
Employee benefit plans (4,371) (1,979) 3,011
Deferred issuance costs on debt 1,199 1,242 928
Disposal of plant and equipment, net 512 781 (1,587)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities 1,750 740 (1,028)
Changes in working capital, net of acquisition 8,776 642 (11,809)
Change in taxes receivable, net (5,099) (1,078) 9,461
Excess tax benefits from equity-based payment arrangements   (312) (1,433)
Funding of qualified pension plans     3,179
Other, net 1,585 (1,592) (1,591)
Net cash flows from operating activities 167,587 149,830 136,615
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net   250 49,750
Additions to property, plant and equipment (193,864) (145,579) (121,720)
Payments to Acquire Businesses, Net of Cash Acquired   67,443  
Proceeds from sale of assets 283 0 0
Net cash flows from investing activities (193,581) (212,772) (71,970)
CASH FLOWS FROM FINANCING ACTIVITIES      
Purchase of treasury stock (4,875) (65,327) (99,990)
Proceeds from Lines of Credit 298,308 1,273,959  
Repayments of Lines of Credit (278,308) (1,138,959)  
Payments for debt issuance costs   (1,906)  
Payment of tax withholdings on equity-based payment arrangements (1,127) (933) (4,152)
Excess tax benefits from equity-based payment arrangements   312 1,433
Other, net (134)   (139)
Net cash flows from financing activities 22,146 76,918 (86,366)
(Decrease) increase in cash and cash equivalents (3,848) 13,976 (21,721)
Cash and cash equivalents at beginning of period 19,586 5,610 27,331
Cash and cash equivalents at end of period 15,738 19,586 5,610
Guarantor Subsidiaries      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings 11,911 5,331 2,476
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 28,128 22,594 19,654
Equity-based compensation expense 0 0 0
Deferred taxes (23,632) 605 3,178
Employee benefit plans 0 0 0
Deferred issuance costs on debt 0 0 0
Disposal of plant and equipment, net 3,541 600 (95)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities 0 (18) (8)
Changes in working capital, net of acquisition 5,529 774 3,032
Change in taxes receivable, net (5) (1,405) (14,388)
Excess tax benefits from equity-based payment arrangements   0 0
Funding of qualified pension plans     0
Other, net (3,094) (921) (1,131)
Net cash flows from operating activities 22,378 27,596 12,734
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net   0 0
Additions to property, plant and equipment (5,884) (9,770) (7,182)
Payments to Acquire Businesses, Net of Cash Acquired   0  
Proceeds from sale of assets 668 36 604
Net cash flows from investing activities (5,216) (9,734) (6,578)
CASH FLOWS FROM FINANCING ACTIVITIES      
Purchase of treasury stock 0 0 0
Proceeds from Lines of Credit 0 0  
Repayments of Lines of Credit 0 0  
Payments for debt issuance costs   0  
Payment of tax withholdings on equity-based payment arrangements 0 0 0
Excess tax benefits from equity-based payment arrangements   0 0
Other, net 0   0
Net cash flows from financing activities (20,577) (14,447) (6,156)
(Decrease) increase in cash and cash equivalents (3,415) 3,415 0
Cash and cash equivalents at beginning of period 3,415 0 0
Cash and cash equivalents at end of period $ 0 $ 3,415 $ 0