Supplemental Guarantor Financial Information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	$ (5,600)	$ (143,800)	$ 97,300
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Goodwill, Impairment Loss	0	195,100	0
Depreciation and amortization	115,600	101,900	105,000
Equity-based compensation expense	4,100	3,300	3,600
Deferred tax expense (benefit)	(300)	7,100	(40,600)
Pension and other post employment benefits	1,400	(600)	(5,100)
Debt retirement costs	2,700	0	0
Amortization of deferred issuance costs on debt	2,000	1,400	1,200
Gain on divested assets, net		(25,500)
Disposal of plant and equipment, net	700	700	4,100
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	2,500	1,500	2,900
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	(13,600)	(7,300)	5,600
(Increase) decrease in taxes receivable, net	(4,400)	14,000	(10,600)
Increase (Decrease) in Inventories	(21,200)	(8,100)	(14,800)
Increase (Decrease) in Other Current Assets	(800)	6,400	(300)
Increase (Decrease) in Accounts Payable	(28,500)	25,200	31,300
Other, net	3,000	(1,000)	300
Net cash flows from operating activities	55,600	168,900	178,700
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(140,100)	(295,700)	(199,700)
Net proceeds from divested assets		70,900
Proceeds from Sale of Productive Assets	0	70,900	0
Payments for (Proceeds from) Other Investing Activities	0	800	900
Net cash flows from investing activities	(140,100)	(224,000)	(198,800)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock	0	0	(4,900)
Proceeds from Short-term Debt	549,300	630,800	298,300
Repayments of Short-term Debt	(657,700)	(565,000)	(278,300)
Proceeds from long-term debt, net	296,100	0	0
Repayments of Debt	(103,000)	0	0
Investment (to) from Parent	0	0	0
Payments for debt issuance costs	(2,300)	(2,100)	(100)
Payment of tax withholdings on equity-based payment arrangements	(400)	(400)	(1,100)
Other, net	(400)	(400)	(1,200)
Net cash flows from financing activities	82,000	63,300	13,800
Increase (decrease) in cash, cash equivalents and restricted cash			(6,300)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(2,500)	8,200	(6,300)
Cash, cash equivalents and restricted cash at beginning of period	22,500	15,700
Cash, cash equivalents and restricted cash at end of period	20,000	22,500	15,700
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	22,400	24,900	16,700	$ 23,000
Issuer
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	1,100	(140,000)	99,700
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Goodwill, Impairment Loss		195,100
Depreciation and amortization	99,500	81,800	76,900
Equity-based compensation expense	4,100	3,300	3,600
Deferred tax expense (benefit)	(5,000)	15,000	(17,000)
Pension and other post employment benefits	1,400	(600)	(5,100)
Debt retirement costs	2,700
Gain on divested assets, net		0
Disposal of plant and equipment, net	700	700	500
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	2,500	1,500	2,900
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	(25,000)	(3,800)	3,400
(Increase) decrease in taxes receivable, net	6,000	3,600	(5,100)
Increase (Decrease) in Inventories	(27,200)	1,000	(25,200)
Increase (Decrease) in Other Current Assets	(700)	6,400	(600)
Increase (Decrease) in Accounts Payable	(25,100)	20,900	31,100
Other, net	2,900	(1,200)	3,400
Net cash flows from operating activities	37,900	183,700	168,500
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(138,200)	(293,800)	(193,800)
Net proceeds from divested assets		70,900
Payments for (Proceeds from) Other Investing Activities		800	300
Net cash flows from investing activities	(138,200)	(222,100)	(193,500)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock			(4,900)
Proceeds from Short-term Debt	549,300	630,800	298,300
Repayments of Short-term Debt	(657,700)	(565,000)	(278,300)
Proceeds from long-term debt, net	296,100
Repayments of Debt	(103,000)
Investment (to) from Parent	15,800	(16,700)	8,300
Payments for debt issuance costs	(2,300)	(2,100)	(100)
Other, net	(400)	(400)	(1,200)
Net cash flows from financing activities	97,800	46,600	22,100
Increase (decrease) in cash, cash equivalents and restricted cash			(2,900)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(2,500)	8,200
Cash, cash equivalents and restricted cash at beginning of period	22,500
Cash, cash equivalents and restricted cash at end of period	20,000	22,500
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	22,400	24,900	16,700	19,600
Guarantor Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	3,800	18,300	11,900
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Goodwill, Impairment Loss		0
Depreciation and amortization	16,100	20,100	28,100
Equity-based compensation expense	0	0	0
Deferred tax expense (benefit)	4,700	(7,900)	(23,600)
Pension and other post employment benefits	0	0	0
Debt retirement costs	0
Gain on divested assets, net		(25,500)
Disposal of plant and equipment, net	0	0	3,600
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	0	0	0
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	11,400	(3,500)	12,500
(Increase) decrease in taxes receivable, net	0	0	0
Increase (Decrease) in Inventories	6,200	(10,300)	8,400
Increase (Decrease) in Other Current Assets	(100)	0	300
Increase (Decrease) in Accounts Payable	(13,800)	14,700	(15,600)
Other, net	100	200	(3,100)
Net cash flows from operating activities	28,400	6,100	22,500
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(1,900)	(1,900)	(5,900)
Net proceeds from divested assets		0
Payments for (Proceeds from) Other Investing Activities		0	600
Net cash flows from investing activities	(1,900)	(1,900)	(5,300)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock			0
Proceeds from Short-term Debt	0	0	0
Repayments of Short-term Debt	0	0	0
Proceeds from long-term debt, net	0
Repayments of Debt	0
Investment (to) from Parent	(26,500)	(4,200)	(20,600)
Payments for debt issuance costs	0	0	0
Other, net	0	0	0
Net cash flows from financing activities	(26,500)	(4,200)	(20,600)
Increase (decrease) in cash, cash equivalents and restricted cash			(3,400)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	0	0
Cash, cash equivalents and restricted cash at beginning of period	0
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	0	3,400
Consolidation, Eliminations [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss) Attributable to Parent	(10,500)	(22,100)	(14,300)
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Goodwill, Impairment Loss		0
Depreciation and amortization	0	0	0
Equity-based compensation expense	0	0	0
Deferred tax expense (benefit)	0	0	0
Pension and other post employment benefits	0	0	0
Debt retirement costs	0
Gain on divested assets, net		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
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	0	0	(10,300)
(Increase) decrease in taxes receivable, net	(10,400)	10,400	(5,500)
Increase (Decrease) in Inventories	(200)	1,200	2,000
Increase (Decrease) in Other Current Assets	0	0	0
Increase (Decrease) in Accounts Payable	10,400	(10,400)	15,800
Other, net	0	0	0
Net cash flows from operating activities	(10,700)	(20,900)	(12,300)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	0	0	0
Net proceeds from divested assets		0
Payments for (Proceeds from) Other Investing Activities		0	0
Net cash flows from investing activities	0	0	0
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock			0
Proceeds from Short-term Debt	0	0	0
Repayments of Short-term Debt	0	0	0
Proceeds from long-term debt, net	0
Repayments of Debt	0
Investment (to) from Parent	10,700	20,900	12,300
Payments for debt issuance costs	0	0	0
Other, net	0	0	0
Net cash flows from financing activities	10,700	20,900	12,300
Increase (decrease) in cash, cash equivalents and restricted cash			0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	0	0
Cash, cash equivalents and restricted cash at beginning of period	0
Cash, cash equivalents and restricted cash at end of period	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0	$ 0	$ 0	$ 0