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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net earnings | $ 227,970 | $ 284,608 | $ 256,299
Adjustments to reconcile net earnings to net cash provided by operations: |  |  |
Depreciation and amortization | 192,240 | 169,312 | 164,437
Provision for doubtful accounts | 1,426 | 3,577 | 1,260
Provision for deferred income taxes | 62,755 | 77,976 | 103,056
Gain on disposition of assets | (1,672) | (781) | (888)
Equity in earnings of affiliates, net of distributions and contributions | 449 | (384) | (348)
Amortization of unearned share-based compensation | 11,104 | 11,591 | 11,621
Amortization of major maintenance costs | 22,126 | 16,409 | 9,029
Increase (decrease) in cash flows resulting from changes in: |  |  |
Accounts receivable | 129,908 | (176,544) | 2,235
Inventory | (7,320) | (56,468) | 43,275
Other assets | (14,174) | (11,783) | (47,526)
Income taxes payable | 477 | (4,544) | 313
Accounts payable | (81,808) | 44,645 | 23,088
Accrued and other liabilities | (22,176) | 81,295 | 35,181
Net cash provided by operating activities | 521,305 | 438,909 | 601,032
Cash flows from investing activities: |  |  |
Capital expenditures | (345,475) | (355,144) | (253,227)
Acquisitions of businesses and marine equipment, net of cash acquired | (41,250) | (31,800) | (3,643)
Proceeds from disposition of assets | 24,429 | 10,393 | 33,982
Net cash used in investing activities | (362,296) | (376,551) | (222,888)
Cash flows from financing activities: |  |  |
Borrowings (payments) on bank credit facilities, net | 160,784 | 75,550 | (150,960)
Borrowings on long-term debt | 0 | 0 | 225,000
Payments on long-term debt | (100,000) | (108,000) | (460,000)
Return of investment to noncontrolling interests | (1,778) | (3,192) | (3,857)
Proceeds from exercise of stock options | 3,712 | 7,519 | 6,635
Purchase of treasury stock | (241,105) | (15,321) | 0
Payment of contingent liability | 0 | (4,756) | (5,000)
Excess tax benefit from equity compensation plans | 964 | 6,119 | 3,001
Net cash used in financing activities | (177,423) | (42,081) | (385,181)
Increase (decrease) in cash and cash equivalents | (18,414) | 20,277 | (7,037)
Cash and cash equivalents, beginning of year | 24,299 | 4,022 | 11,059
Cash and cash equivalents, end of year | 5,885 | 24,299 | 4,022
Supplemental disclosures of cash flow information: |  |  |
Interest paid | 20,586 | 19,622 | 21,393
Income taxes paid | 69,584 | 90,460 | 46,136
Capital expenditures included in accounts payable | $ 2,206 | $ 0 | $ 0

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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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