Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (264,467)	$ 163,052	$ 6,663
Adjustments to reconcile net income to net cash provided by (used by) operating activities:
Depreciation and amortization of continuing operations	71,128	52,406	50,721
Depreciation and amortization of discontinued operations	0	7,722	11,852
Amortization of debt issuance costs	4,845	4,296	4,168
Goodwill impairment	182,542	0	0
Other impairments	21,825	0	0
Loss on extinguishment of debt and write-off of debt issuance costs	19,562	42,087	2,589
Total derivative mark-to-market loss (gain), net of cash settlements	0	(1,483)	2,563
Share of net income from joint venture, net of cash dividends received	642	(1,284)	(2,232)
Gain on disposal of discontinued operations, net of tax and cost to sell	0	(133,665)	0
Compensation expense from issuance of share-based awards	2,416	4,730	3,935
Deferred income taxes	(20,758)	(23,195)	(15,526)
Other	1,290	100	308
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(3,543)	(11,374)	(18,505)
Inventories	(16,872)	(10,278)	4,377
Accounts payable	2,693	4,118	7,633
Income taxes receivable and payable, net	40,946	(124,389)	(217)
Other	(1,310)	(1,076)	11,023
Net cash provided by (used by) operating activities	40,939	(28,233)	69,352
Cash flows from investing activities:
Acquisition of property, plant and equipment, net of acquisitions	(64,036)	(43,722)	(43,820)
Short term investment	0	(8,000)	0
Proceeds from sale of business, net of cash sold	838	371,436	0
Cash paid to acquire businesses, net of cash received	(399,009)	(38,434)	0
Other	917	1,191	2,596
Net cash provided by (used by) investing activities	(461,290)	282,471	(41,224)
Cash flows from financing activities:
Cash paid for debt issuance or prepayment costs	(20,726)	(40,235)	(3,952)
Dividends paid	(8,826)	(7,695)	(7,584)
Proceeds from issuance of shares of common stock	217,312	0	0
Proceeds from long-term debt	311,841	322,000	44,000
Repayment of long-term debt	(290,687)	(314,313)	(55,000)
Proceeds from (repayments of) short-term debt, net	10,305	(4,211)	(456)
Other	4,126	1,382	1,489
Net cash provided by (used by) financing activities	215,093	(45,836)	(24,481)
Effect of exchange rate changes on cash flows	(1,200)	1,639	(4,329)
Net change in cash and cash equivalents	(206,458)	210,041	(682)
Cash and cash equivalents at beginning of period	224,446	14,405	15,087
Cash and cash equivalents at end of period	17,988	224,446	14,405
Supplemental schedule of non-cash operating, investing and financing activities:
Dividends accrued (reversed) for performance share units, net	(83)	192	0
Non-cash additions to property, plant and equipment	26,605	1,436	0
Restructuring charges in other current and non-current liabilities	2,071	222	3,238
Supplemental disclosures:
Cash paid for interest	56,223	52,083	59,158
Cash paid (received) for income taxes	$ (32,582)	$ 72,294	889
Cash and cash equivalents included in discontinued operations			$ 8,100