Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income (loss)	$ 26,999	$ 3,395
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Non-cash operating items (Note 2)	(46,042)	(14,231)
Changes in operating assets and liabilities:
Other current assets	38	6,010
Accrued employment costs and other current liabilities	7,645	(117)
Income taxes receivable and payable	(72)	(945)
Pension and other postretirement liabilities	(966)	(1,833)
Other liabilities	753	2,170
Net cash (used in) provided by operating activities	(11,645)	(5,551)
Financing activities:
Dividend paid	0	(170,130)
Net cash (used in) provided by financing activities	0	(170,130)
Cash, cash equivalents and restricted cash - period (decrease) increase	(11,645)	(175,681)
Cash, cash equivalents and restricted cash (Note 2) - beginning of year	31,935	259,371
Cash, cash equivalents and restricted cash (Note 2) - end of period	$ 20,290	$ 83,690