CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 173,623	$ 180,442
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	87,298	71,771
Amortization of debt issuance costs and debt discount	2,535	3,060
Loss on extinguishment of debt, net	5,349	4,654
Deferred income taxes	3,155	36,547
Stock compensation expense	12,098	9,380
Net gain on sale of assets and asset impairments	(1,413)	(1,502)
Changes in assets and liabilities, net of assets acquired and liabilities assumed:
Receivables	(230,627)	(41,083)
Inventories	(189,692)	22,263
Other current assets	(5,076)	8,968
Other assets and liabilities	60,439	1,756
Accounts payable	205,570	73,913
Accrued liabilities	31,887	(9,905)
Net cash provided by operating activities	155,146	360,264
Cash flows from investing activities:
Purchases of property, plant and equipment	(83,508)	(77,937)
Proceeds from sale of property, plant and equipment	3,298	5,474
Cash used for acquisitions	15,893	33,931
Net cash used in investing activities	(96,103)	(106,394)
Cash flows from financing activities:
Borrowings under revolving credit facility	791,000	885,000
Repayments under revolving credit facility	(818,000)	(1,064,000)
Proceeds from issuance of notes	895,625	478,375
Repayments of long-term debt and other loans	(561,541)	(502,062)
Payments of debt extinguishment costs	22,686	2,301
Payments of loan costs	13,800	8,566
Exercise of stock options	1,343	3,220
Repurchase of common stock	(4,153)	(10,392)
Net cash provided by (used in) financing activities	267,788	(220,726)
Net change in cash and cash equivalents	326,831	33,144
Cash and cash equivalents at beginning of the period	14,096	10,127
Cash and cash equivalents at end of the period	340,927	43,271
Supplemental disclosures of cash flow information:
Cash paid for interest	77,734	76,326
Cash paid for income taxes	21,280	9,989
Supplemental disclosures of non-cash activities:
Accrued purchases of property, plant and equipment	1,336	2,127
Acquisition of assets under operating lease obligations	33,379	64,940
Acquisition of assets under finance lease obligations	$ 16,096	$ 11,653