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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |  |
Net income |  | $ 1,725,416 | $ 313,537 | $ 221,809
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 547,352 | 116,566 | 100,038
Amortization of debt discount, premium and issuance costs |  | 3,869 | 3,508 | 3,880
Loss on extinguishment of debt |  | 3,027 | 6,700 | 8,189
Deferred income taxes |  | (34,573) | 16,614 | 50,994
Stock-based compensation expense |  | 31,486 | 17,022 | 12,239
Net gain on sales of assets and asset impairments |  | (32,421) | (1,067) | (949)
Changes in assets and liabilities, net of assets acquired and liabilities assumed: |  |  |  |
Receivables |  | (453,911) | (246,912) | 45,687
Inventories |  | (282,165) | (220,101) | 44,202
Contract assets |  | 103,326 | 12,631 | 2,898
Other current assets |  | (33,489) | (19,743) | 4,674
Other assets and liabilities |  | (1,155) | 50,370 | 1,611
Accounts payable |  | 191,885 | 160,947 | 4,070
Accrued liabilities |  | 91,419 | 55,361 | 7,004
Contract liabilities |  | 90,135 | 19,896 | 3,496
Net cash provided by operating activities |  | 1,743,549 | 260,067 | 504,046
Cash flows from investing activities: |  |  |  |
Cash used for acquisitions, net of cash acquired |  | (1,206,471) | (32,643) | (92,855)
Proceeds from divestiture of business |  | 76,162 |  |
Purchases of property, plant and equipment |  | (227,891) | (112,082) | (112,870)
Proceeds from sale of property, plant and equipment |  | 13,560 | 8,500 | 6,545
Net cash used in investing activities |  | (1,344,640) | (136,225) | (199,180)
Cash flows from financing activities: |  |  |  |
Borrowings under revolving credit facility |  | 3,125,000 | 891,000 | 1,040,000
Repayments under revolving credit facility |  | (2,612,000) | (843,000) | (1,192,000)
Proceeds from long-term debt and other loans |  | 1,000,000 | 895,625 | 478,375
Repayments of long-term debt and other loans |  | (554,677) | (618,542) | (610,834)
Payments of debt extinguishment costs |  | (4,950) | (22,686) | (2,301)
Payments of loan costs |  | (19,450) | (13,800) | (8,618)
Exercise of stock options |  | 726 | 1,424 | 4,873
Repurchase of common stock |  | (1,714,761) | (4,153) | (10,392)
Net cash (used in) provided by financing activities |  | (780,112) | 285,868 | (300,897)
Net change in cash and cash equivalents |  | (381,203) | 409,710 | 3,969
Cash and cash equivalents at beginning of period |  | 423,806 | 14,096 | 10,127
Cash and cash equivalents at end of period |  | 42,603 | 423,806 | 14,096
Supplemental disclosures of cash flow information: |  |  |  |
Cash paid for interest | [1] | 105,570 | 110,600 | 100,354
Cash paid for income taxes |  | 633,060 | 43,400 | 18,107
Supplemental disclosures of non-cash activities: |  |  |  |
Non-cash consideration for the BMC Merger |  | 3,658,362 |  |
Accrued purchases of property, plant and equipment |  | 8,052 | 1,962 | 3,378
Right-of-use assets obtained in exchange for operating lease obligations |  | 64,939 | 42,606 | 86,373
Assets acquired under finance lease obligations |  | 1,644 | $ 16,964 | $ 16,462
Amounts accrued for repurchases of common stock |  | $ 51,545 |  |
[1] | Includes $5.0 million, $22.7 million and $2.3 million of debt extinguishment costs paid in 2021, 2020, and 2019, respectively, classified as financing outflows above and discussed more fully in Note 8.

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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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