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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 172,580 $ 8,767
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 134,331 29,400
Deferred income taxes (8,857) 875
Stock-based compensation expense 10,402 3,254
Other non-cash adjustments 2,874 5,900
Changes in assets and liabilities, net of assets acquired and liabilities assumed:    
Receivables (384,123) (61,998)
Inventories (340,940) (78,591)
Other current assets (27,664) (5,000)
Other assets and liabilities 1,999 26,286
Accounts payable 241,621 108,295
Accrued liabilities (2,731) (87,842)
Net cash used in operating activities (200,508) (50,654)
Cash flows from investing activities:    
Purchases of property, plant and equipment (39,263) (28,498)
Proceeds from sale of property, plant and equipment 3,194 538
Cash acquired in BMC Merger 167,490  
Cash used for acquisitions   (15,893)
Net cash provided by (used in) investing activities 131,421 (43,853)
Cash flows from financing activities:    
Borrowings under revolving credit facility 410,000 681,000
Repayments under revolving credit facility (260,000) (398,000)
Proceeds from long-term debt and other loans   550,000
Repayments of long-term debt and other loans (468,671) (554,263)
Payments of debt extinguishment costs (2,475) (22,686)
Payments of loan costs (4,272) (8,332)
Exercise of stock options 235 398
Repurchase of common stock (10,418) (3,834)
Net cash (used in) provided by financing activities (335,601) 244,283
Net change in cash and cash equivalents (404,688) 149,776
Cash and cash equivalents at beginning of period 423,806 14,096
Cash and cash equivalents at end of period 19,118 163,872
Supplemental disclosures of cash flow information:    
Cash paid for interest 21,922 21,651
Cash paid for income taxes 21,701 150
Supplemental disclosures of non-cash activities:    
Non-cash consideration for the BMC Merger 3,658,362  
Accrued purchases of property, plant and equipment 6,734 5,238
Acquisition of assets under operating lease obligations 13,707 9,437
Acquisition of assets under finance lease obligations $ 1,644 $ 2,679