Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net loss		$ (100,592)	$ (46,741)	$ (262,987)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization of continuing operations		45,680	44,896	43,026
Depreciation and amortization of discontinued operations		35,731	46,950	28,102
Amortization of debt issuance costs		15,692	4,789	4,845
Goodwill impairment of continuing operations		92,942	0	182,542
Goodwill impairment of discontinued operations		146,757	0	0
Other impairments		4,148	643	21,825
Loss on extinguishment of debt and write-off of debt issuance costs		1,532	3,293	19,562
Total derivative loss, net of cash settlements		15,802	0	0
Share of net income (loss) from joint venture, net of cash dividends received		(3,626)	(1,681)	642
Gain on disposal of discontinued operations, net of tax and cost to sell		(233,824)	0	0
Compensation expense from issuance of share-based awards		4,226	2,822	2,416
Deferred income taxes		(21,697)	(3,142)	(22,402)
Other		(4,730)	3,169	1,290
Changes in operating assets and liabilities:
Accounts receivable		10,831	1,265	(3,543)
Inventories		5,114	1,426	(16,208)
Accounts payable		(8,606)	(7,900)	2,693
Income taxes receivable and payable, net		(633)	(5,292)	39,615
Other		10,802	4,711	(479)
Net cash provided by operating activities		15,549	49,208	40,939
Cash flows from investing activities
Acquisition of property, plant and equipment		(23,773)	(54,003)	(64,036)
Proceeds from liquidation of short-term investment		0	8,000	0
Proceeds from sale of business, net of cash sold		743,178	0	838
Cash paid to acquire businesses, net of cash received		0	0	(399,009)
Proceeds from sale of property, plant, and equipment		3,317	7,287	1,434
Cash settlements of interest rate swap		(4,133)	0	0
Other		695	(711)	(517)
Net cash provided by (used in) investing activities		719,284	(39,427)	(461,290)
Cash flows from financing activities
Cash paid for debt issuance costs		(661)	(11,336)	(20,726)
Dividends paid		0	(8,879)	(8,826)
Proceeds from issuance of common stock		0	0	217,312
Proceeds from issuance of preferred stock		0	95,741	0
Proceeds from long-term debt		66,195	54,209	311,841
Repayments of long-term debt		(776,331)	(108,157)	(290,687)
Proceeds from (repayments of) short-term debt, net		(924)	(12,564)	10,305
Other		(3,133)	(3,715)	(4,126)
Net cash provided by (used in) financing activities		(714,854)	5,299	215,093
Effect of exchange rate changes on cash flows		(3,544)	(1,365)	(1,200)
Net change in cash and cash equivalents		16,435	13,715	(206,458)
Cash and cash equivalents at beginning of period	[1]	31,703	17,988	224,446
Cash and cash equivalents at end of period	[1]	48,138	31,703	17,988
Supplemental schedule of non-cash operating, investing and financing activities:
Non-cash additions to property, plant and equipment		9,644	23,281	26,605
Restructuring charges in other current and non-current liabilities		0	(12)	2,071
Supplemental disclosures:
Cash paid for interest		51,542	50,514	56,223
Cash paid (received) for income taxes		$ 2,241	$ 6,428	$ (32,582)

[1] Cash and cash equivalents include $13.8 million, $10.2 million, and $0.2 million of cash and cash equivalents that were included in current assets of discontinued operations as of December 31, 2019; December 31, 2018; and December 31, 2017, respectively.