CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (3,102)	$ (142,701)
Adjustments to reconcile net loss to operating cash flows:
Depreciation and amortization	47,783	58,103
Share-based compensation expense	3,393	3,423
Non-cash interest expense	5,316	6,118
(Gain) loss on sale or disposal of assets, net	(2,804)	4,745
Loss on convertible notes derivative	0	126,600
Loss on early extinguishment of debt	2,743	19,401
Asset impairments	854	833
Pension and other postretirement benefit obligations	(27,291)	(48,538)
Change in other assets and liabilities, net	5,537	33,332
Cash provided by operating activities	32,429	61,316
Investing activities
Acquisitions, net of cash acquired	(15,427)	0
Purchase of property, plant and equipment	(10,764)	(7,607)
Proceeds from sale of real estate and other assets	20,471	10,123
Change in other investing activities	(500)	0
Cash provided by (used for) investing activities	(6,220)	2,516
Financing activities
Payments of deferred financing costs	(423)	(33,921)
Borrowings under term loans	72,500	1,045,000
Repayments under term loans	(47,976)	(1,083,791)
Repayments of long-term debt	(22,500)	0
Acquisition of noncontrolling interests	2,050	0
Payments for employee taxes withheld from stock awards	(3,138)	(1,707)
Changes in other financing activities	(231)	(280)
Cash used for financing activities	(3,818)	(74,699)
Effect of currency exchange rate change on cash	(992)	314
Increase (decrease) in cash, cash equivalents and restricted cash	21,399	(10,553)
Cash, cash equivalents and restricted cash at beginning of period	143,619	206,726
Cash, cash equivalents and restricted cash at end of period	$ 165,018	$ 196,173