Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (405,041)	$ (14,648)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	26,409	31,551
Impairments of goodwill	406,056	0
Impairments of inventories	25,230	0
Impairment of fixed assets	5,198	0
Stock-based compensation expense	1,162	4,425
Amortization of debt discount and deferred financing costs	1,681	1,937
Deferred income tax benefit	(40,832)	(1,513)
Gain on disposals of assets	(513)	(418)
Other, net	771	(340)
Changes in operating assets and liabilities:
Accounts receivable	4,617	21,893
Inventories	(15,332)	2,735
Accounts payable and accrued liabilities	(8,625)	(9,576)
Income taxes payable	(1,100)	1,878
Other operating assets and liabilities, net	5,768	(3,632)
Net cash flows provided by operating activities	5,449	34,292
Cash flows from investing activities:
Capital expenditures	(5,881)	(17,922)
Proceeds from disposition of property, plant and equipment	4,092	368
Other, net	(256)	(304)
Net cash flows used in investing activities	(2,045)	(17,858)
Cash flows from financing activities:
Revolving credit facility borrowings	72,173	57,874
Revolving credit facility repayments	(52,404)	(73,774)
Purchase of 1.50% convertible senior notes	(4,737)	0
Other debt and finance lease activity, net	35	(142)
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	(2,665)	(3,610)
Purchase of treasury stock	0	(757)
Net cash flows provided by (used in) financing activities	12,402	(20,409)
Effect of exchange rate changes on cash and cash equivalents	9	(32)
Net change in cash and cash equivalents	15,815	(4,007)
Cash and cash equivalents, beginning of period	8,493	19,316
Cash and cash equivalents, end of period	24,308	15,309
Cash paid for:
Interest	2,436	3,460
Income taxes, net of refunds	$ 2,499	$ (487)