CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net loss	$ (72,605)	$ (19,328)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	38,449	44,600
Goodwill and other asset impairments	103,866	0
Debt issuance amortization	860	1,322
Original issue discount amortization	690	265
Deferred income taxes	(36,979)	(2,553)
Deferred revenue	(2,525)	(7,576)
(Gain) loss on disposal of property, plant and equipment	(419)	113
Equity-based compensation	2,847	4,045
Provision for credit losses, net of recoveries	902	721
Other	(16,792)	(3,872)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(13,471)	(43,583)
Inventories	2,917	18,938
Prepaid expenses and other current assets	(4,820)	3,151
Income taxes	578	812
Accounts payable and accrued expenses	(40,455)	12,970
Liability for pension and other post-retirement benefits	6,751	924
Other noncurrent assets and liabilities	(10,597)	(48)
Net cash (used in) provided by operating activities	(40,803)	10,901
Investing activities:
Capital expenditures	(16,116)	(44,376)
Capitalized intellectual property costs	(494)	(1,307)
Proceeds from sale of property, plant and equipment	224	0
Net cash used in investing activities	(16,386)	(45,683)
Financing activities:
Dividends paid	(4,604)	(4,690)
Proceeds from options exercised	0	128
Tax payments related to shares withheld for vested restricted stock and stock units	(457)	(2,205)
Proceeds from draw down of the Revolver	25,000	0
Payments on long-term debt	(3,782)	(4,043)
(Distributions to) contributions from non-controlling interest	(4)	4,729
Principal payments on finance lease obligations	(3)	(20)
Net cash provided by (used in) financing activities	16,150	(6,101)
Net decrease in cash and cash equivalents	(41,039)	(40,883)
Cash and cash equivalents, beginning of period	185,740	202,498
Cash and cash equivalents, end of period	144,701	161,615
Cash paid during the period for:
Interest	20,677	21,557
Taxes, net of refunds	101	(472)
Non-cash items:
Accrued capital expenditures	20,111	39,239
Net assets assumed in business acquisition	$ 10,955	$ 0