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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |
Net earnings | $ 103,409 | $ 82,406
Adjustments to reconcile net earnings to net cash provided by operations: |  |
Depreciation and amortization | 167,640 | 147,669
Provision for deferred income taxes | 36,838 | 32,783
Amortization of unearned share-based compensation | 16,649 | 8,991
Amortization of major maintenance costs | 15,600 | 15,232
Amortization of debt issuance costs | 898 | 786
Other | (2,023) | 180
Decrease in cash flows resulting from changes in operating assets and liabilities, net | (66,707) | (28,592)
Net cash provided by operating activities | 272,304 | 259,455
Cash flows from investing activities: |  |
Capital expenditures | (231,752) | (133,437)
Acquisitions of businesses and marine equipment, net of cash acquired | (499,227) | (451,219)
Proceeds from disposition of assets | 27,806 | 29,743
Net cash used in investing activities | (703,173) | (554,913)
Cash flows from financing activities: |  |
Borrowings (payments) on bank credit facilities | (88,392) | 298,424
Borrowings (payments) on long-term debt | 499,295 | (1,065)
Payments of debt issue costs | (4,276) | (1,243)
Proceeds from exercise of stock options | 13,264 | 2,076
Payments related to tax withholding for share-based compensation | (4,821) | (2,899)
Other | (686) | (643)
Net cash provided by financing activities | 414,384 | 294,650
Decrease in cash and cash equivalents | (16,485) | (808)
Cash and cash equivalents, beginning of year | 20,102 | 5,634
Cash and cash equivalents, end of period | 3,617 | 4,826
Cash paid during the period: |  |
Interest paid | 37,175 | 18,390
Income taxes | 495 | 19,388
Capital expenditures included in accounts payable | (5,554) | 8,917
Non-cash investing activity: |  |
Stock issued in acquisition | 0 | 366,554
Cash acquired in acquisition | 2,313 | 98
Debt assumed in acquisition | $ 0 | $ 13,724

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