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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (257,920) | $ (294,007)
Adjustments to reconcile net loss to net cash provided by operations |  |
Depreciation and amortization | 163,484 | 165,067
Provision (benefit) for deferred income taxes | (56,448) | 5,382
Impairments and other charges | 340,713 | 561,274
Amortization of unearned share-based compensation | 12,793 | 12,066
Amortization of major maintenance costs | 26,189 | 21,857
Other | (6,290) | 3,523
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net | 57,841 | (115,399)
Net cash provided by operating activities | 280,362 | 359,763
Cash flows from investing activities: |  |
Capital expenditures | (71,968) | (129,371)
Acquisitions of businesses and marine equipment | (7,470) | (348,772)
Proceeds from disposition of assets | 39,163 | 6,538
Net cash used in investing activities | (40,275) | (471,605)
Cash flows from financing activities: |  |
Borrowings (payments) on bank credit facilities, net | (248,057) | 360,139
Payments on long-term debt | (15,000) | (150,000)
Proceeds from exercise of stock options | 629 | 353
Payments related to tax withholding for share-based compensation | (2,856) | (3,193)
Return of investment to noncontrolling interest | (764) | (608)
Net cash provided by (used in) financing activities | (266,048) | 206,691
Increase (decrease) in cash and cash equivalents | (25,961) | 94,849
Cash and cash equivalents, beginning of year | 80,338 | 24,737
Cash and cash equivalents, end of period | 54,377 | 119,586
Cash paid (received) during the period: |  |
Interest paid | 39,134 | 45,776
Income taxes refunded, net | (116,010) | (36,499)
Operating cash outflow from operating leases | 33,575 | 32,507
Non-cash investing activity: |  |
Capital expenditures included in accounts payable | (13,549) | 11,441
Right-of-use assets obtained in exchange for lease obligations | $ 18,117 | $ 42,470

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