Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	$ 66,333	$ 4,963	$ 28,459
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,712	40,388	43,969
Loss on asset sales and disposals	567	674	514
Change in accounts receivable	(6,312)	(1,808)	(12,674)
Change in inventories	(12,006)	(10,828)	(3,932)
Change in accounts payable	(3,466)	5,088	12,190
Accrued interest and amortization of discounts and finance fees	1,291	2,039	1,496
Call premium on senior notes	0	(37,348)	(1,350)
Write-off of finance fees on senior notes	0	9,086	1,168
Pension & non-pension postretirement benefits, net	18,865	(879)	7,746
Restructuring	0	(289)	2,212
Accrued liabilities & prepaid expenses	4,140	(7,222)	(17,507)
Income taxes	(45,003)	885	(1,804)
Share-based compensation expense	5,917	5,283	5,063
Excess tax benefit from share-based compensation, operating	(2,797)	0	0
Other operating activities	(4,142)	(2,857)	4,479
Net cash provided by operating activities	66,099	81,871	72,729
Investing activities:
Additions to property, plant and equipment	(48,136)	(54,393)	(49,407)
Proceeds from furnace malfunction insurance recovery	0	2,350	0
Proceeds from asset sales and other	7	24	81
Net cash used in investing activities	(48,129)	(52,019)	(49,326)
Financing activities:
Borrowings on ABL credit facility	62,900	83,000	51,000
Repayments on ABL credit facility	(62,900)	(83,000)	(51,000)
Other repayments	(3,267)	(5,863)	(14,270)
Other borrowings	0	5,214	6,094
Payments on 6.875% senior notes	0	(405,000)	(45,000)
Proceeds from Term Loan B	0	438,900	0
Repayments on Term Loan B	(4,400)	(2,200)	0
Call premium on senior notes	0	(37,348)	(1,350)
Stock options exercised	3,338	4,571	5,384
Excess tax benefit from share-based compensation arrangements, financing	2,797	0	0
Debt issuance costs and other	0	(6,959)	0
Dividends	(9,597)	0	0
Treasury shares purchased	(15,275)	(1,060)	0
Net cash used in financing activities	(26,404)	(9,745)	(49,142)
Effect of exchange rate fluctuations on cash	(2,566)	(2,271)	739
Increase (decrease) in cash	(11,000)	17,836	(25,000)
Cash & cash equivalents at beginning of year	60,044	42,208	67,208
Cash & cash equivalents at end of year	49,044	60,044	42,208
Supplemental disclosure of cash flow information:
Cash paid during the year for interest, net of capitalized interest	16,545	20,302	30,008
Cash paid during the year for income taxes	$ 5,516	$ 7,228	$ 10,855