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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Operating Activities |  |  |  |  |
Net income |  | $ 168,253 | $ 58,464 | [1] |
Adjustments to reconcile net income to net cash provided by continuing operations activities: |  |  |  |  |
(Income) loss from discontinued operations |  | 437 | (969) | [1] |
Depreciation, depletion and amortization |  | 230,733 | 236,154 | [1] |
Dry hole costs (credits) |  | (9) | 2,904 |  |
Amortization of undeveloped leases |  | 13,168 | 9,957 |  |
Accretion of asset retirement obligations |  | 9,914 | 10,556 | [1] |
Deferred income tax (benefit) charge |  | (145,920) | 58,533 |  |
Pretax loss (gain) from disposition of assets |  | 339 | (131,982) |  |
Net decrease in noncash operating working capital |  | 41,554 | 43,418 |  |
Other operating activities, net |  | (39,948) | 18,478 |  |
Net cash provided by operating activities |  | 278,521 | 305,513 |  |
Investing Activities |  |  |  |  |
Property additions and dry hole costs |  | (273,901) | (211,631) |  |
Proceeds from sales of property, plant and equipment |  | 260 | 64,097 |  |
Purchases of investment securities | [2] |  | (212,661) |  |
Proceeds from maturity of investment securities | [2] |  | 113,210 |  |
Net cash required by investing activities |  | (273,641) | (246,985) |  |
Financing Activities |  |  |  |  |
Capital lease obligation payments |  | (2,404) | (9,660) |  |
Withholding tax on stock-based incentive awards |  | (6,642) | (5,808) |  |
Cash dividends paid |  | (43,258) | (43,136) |  |
Net cash provided by financing activities |  | (52,304) | (58,604) |  |
Effect of exchange rate changes on cash and cash equivalents |  | 21,051 | 3,132 |  |
Net increase (decrease) in cash and cash equivalents |  | (26,373) | 3,056 |  |
Cash and cash equivalents at beginning of period |  | 964,988 | 872,797 |  | $ 872,797
Cash and cash equivalents at end of period |  | $ 938,615 | $ 875,853 |  | $ 964,988
[1] | Reclassified to conform to current presentation (see Notes A and B).
[2] | Investments are Canadian government securities with maturities greater than 90 days at the date of acquisition.

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