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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Operating Activities |  |  |  |  |  |  |  |  |
Net income |  | $ 45,518 | $ (17,571) | [1] | $ 213,771 | $ 40,893 | [1] |  |
Adjustments to reconcile net income to net cash provided by continuing operations activities: |  |  |  |  |  |  |  |  |
Loss (Income) from discontinued operations |  | 398 | 217 | [1] | 835 | (752) | [1] |  |
Depreciation, depletion and amortization |  | 237,997 | 234,992 | [1] | 468,730 | 471,146 | [1] |  |
Dry hole costs (credits) |  |  |  |  | (11) | 1,904 |  |  |
Amortization of undeveloped leases |  |  |  |  | 22,774 | 20,306 |  |  |
Accretion of asset retirement obligations |  | 11,028 | 10,428 | [1] | 20,942 | 20,984 | [1] |  |
Deferred income tax (benefit) charge |  |  |  |  | (156,489) | 33,130 |  |  |
Pretax (gain) loss from disposition of assets |  | (220) | 1,333 |  | 118 | (130,648) |  |  |
Net decrease in noncash operating working capital |  |  |  |  | 85,440 | 42,581 |  |  |
Other operating activities, net |  |  |  |  | (31,564) | 91,918 |  |  |
Net cash provided by continuing operations activities |  |  |  |  | 624,546 | 591,462 |  |  |
Investing Activities |  |  |  |  |  |  |  |  |
Property additions and dry hole costs |  |  |  |  | (615,144) | (431,654) |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  | 623 | 64,303 |  |  |
Purchases of investment securities | [2] |  |  |  |  | (212,661) |  |  |
Proceeds from maturity of investment securities | [2] |  |  |  |  | 284,193 |  |  |
Net cash required by investing activities |  |  |  |  | (614,521) | (295,819) |  |  |
Financing Activities |  |  |  |  |  |  |  |  |
Capital lease obligation payments |  |  |  |  | (4,648) | (11,983) |  |  |
Withholding tax on stock-based incentive awards |  |  |  |  | (6,922) | (7,081) |  |  |
Cash dividends paid |  |  |  |  | (86,517) | (86,278) |  |  |
Net cash provided by financing activities |  |  |  |  | (98,087) | (105,342) |  |  |
Effect of exchange rate changes on cash and cash equivalents |  |  |  |  | 24,382 | (4,611) |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  | $ (63,680) | $ 185,690
Cash and cash equivalents at beginning of period |  |  |  |  | 964,988 | 872,797 |  | 872,797 |
Cash and cash equivalents at end of period |  | $ 901,308 | $ 1,058,487 |  | $ 901,308 | $ 1,058,487 |  | $ 964,988 | $ 872,797
[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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