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Supplemental Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net earnings (loss) $ 80,924 $ 863 $ 8,037 $ 7,515 $ 9,343 $ 901 $ 20,864 $ 18,446 $ 97,339 $ 49,554 $ 55,983
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:                      
Depreciation and amortization                 104,990 91,090 84,732
Equity-based compensation expense                 3,620 12,385 4,557
Deferred tax expense (benefit)                 (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 Productive 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
Investment (to) from Parent                 0 0 0
Payments for debt issuance costs                 0 (1,906) 0
Excess tax benefits from equity-based payment arrangements                 0 312 1,433
Payment of tax withholdings on equity-based payment arrangements                 (1,127) (933) (4,152)
Other, net                 (134) 0 (139)
(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 23,001 5,610 27,331
Cash and cash equivalents at end of period 15,738       23,001       15,738 23,001 5,610
Net cash flows from financing activities                 13,864 67,146 (102,848)
Issuer                      
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net earnings (loss)                 99,710 50,773 56,393
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:                      
Depreciation and amortization                 76,862 68,496 65,078
Equity-based compensation expense                 3,620 12,385 4,557
Deferred tax expense (benefit)                 (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 Productive 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)  
Investment (to) from Parent                 8,282 9,772 16,482
Payments for debt issuance costs                   (1,906)  
Excess tax benefits from equity-based payment arrangements                   312 1,433
Payment of tax withholdings on equity-based payment arrangements                 (1,127) (933) (4,152)
Other, net                 (134)   (139)
(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 19,586 5,610 27,331
Cash and cash equivalents at end of period 15,738       19,586       15,738 19,586 5,610
Net cash flows from financing activities                 22,146 76,918 (86,366)
Guarantor Subsidiaries                      
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net earnings (loss)                 11,911 5,331 2,476
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:                      
Depreciation and amortization                 28,128 22,594 19,654
Equity-based compensation expense                 0 0 0
Deferred tax expense (benefit)                 (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 Productive 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  
Investment (to) from Parent                 (20,577) (14,447) (6,156)
Payments for debt issuance costs                   0  
Excess tax benefits from equity-based payment arrangements                   0 0
Payment of tax withholdings on equity-based payment arrangements                 0 0 0
Other, net                 0   0
(Decrease) increase in cash and cash equivalents                 (3,415) 3,415 0
Cash and cash equivalents at beginning of period       3,415       0 3,415 0 0
Cash and cash equivalents at end of period 0       3,415       0 3,415 0
Net cash flows from financing activities                 (20,577) (14,447) (6,156)
Consolidation, Eliminations [Member]                      
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net earnings (loss)                 (14,282) (6,550) (2,886)
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:                      
Depreciation and amortization                 0 0 0
Equity-based compensation expense                 0 0 0
Deferred tax expense (benefit)                 0 (1,138) 2,959
Employee benefit plans                 0 0 0
Deferred issuance costs on debt                 0 0 0
Disposal of plant and equipment, net                 0 0 0
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities                 0 0 0
Changes in working capital, net of acquisition                 7,456 (3,594) 0
Change in taxes receivable, net                 (5,469) 5,469 (10,253)
Excess tax benefits from equity-based payment arrangements                   0 0
Funding of qualified pension plans                     0
Other, net                 0 1,138 0
Net cash flows from operating activities                 (12,295) (4,675) 10,326
CASH FLOWS FROM INVESTING ACTIVITIES                      
Change in short-term investments, net                   0 0
Additions to property, plant and equipment                 0 0 0
Payments to Acquire Businesses, Net of Cash Acquired                   0  
Proceeds from Sale of Productive Assets                 0 0 0
Net cash flows from investing activities                 0 0 0
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  
Investment (to) from Parent                 12,295 4,675 (10,326)
Payments for debt issuance costs                   0  
Excess tax benefits from equity-based payment arrangements                   0 0
Payment of tax withholdings on equity-based payment arrangements                 0 0 0
Other, net                 0   0
(Decrease) increase in cash and cash equivalents                 0 0 0
Cash and cash equivalents at beginning of period       $ 0       $ 0 0 0 0
Cash and cash equivalents at end of period $ 0       $ 0       0 0 0
Net cash flows from financing activities                 $ 12,295 $ 4,675 $ (10,326)