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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net earnings | $ 32,666 | $ 27,645
Adjustments to reconcile net earnings to net cash provided by operations: |  |
Depreciation and amortization | 54,218 | 48,170
Provision (benefit) for deferred income taxes | 8,846 | 8,562
Amortization of unearned share-based compensation | 7,551 | 2,693
Amortization of major maintenance costs | 4,893 | 5,034
Amortization of debt issuance costs | 259 | 200
Other | (1,773) | 1,038
Decrease in cash flows resulting from changes in operating assets and liabilities, net | (87,926) | (8,140)
Net cash provided by operating activities | 18,734 | 85,202
Cash flows from investing activities: |  |
Capital expenditures | (40,961) | (45,765)
Acquisitions of businesses and marine equipment, net of cash acquired | (429,977) | 0
Proceeds from disposition of assets | 12,181 | 7,958
Net cash used in investing activities | (458,757) | (37,807)
Cash flows from financing activities: |  |
Payments on bank credit facilities | (64,414) | (48,451)
Borrowings on long-term debt | 499,295 | 0
Payment of debt issuance cost | (4,251) | 0
Proceeds from exercise of stock options | 292 | 1,258
Payments related to tax withholding for share-based compensation | (3,766) | (2,873)
Other | (225) | (207)
Net cash provided by (used in) financing activities | 426,931 | (50,273)
Decrease in cash and cash equivalents | (13,092) | (2,878)
Cash and cash equivalents, beginning of year | 20,102 | 5,634
Cash and cash equivalents, end of period | 7,010 | 2,756
Cash paid during the period: |  |
Interest paid | 10,763 | 8,856
Income taxes paid (refunded) | (721) | 1,686
Capital expenditures included in accounts payable | (5,448) | (1,778)
Non-cash investing activity: |  |
Cash acquired in acquisition | $ 2,313 | $ 0

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