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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands | Total | Murphy Shareholders' Equity | Cumulative Preferred Stock | Common Stock | Capital In Excess Of Par Value | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss | Treasury Stock | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2018 |  |  |  | $ 195,077 | $ 979,642 | $ 5,513,529 | $ 116,768 | $ (609,787) | $ (1,249,162) | $ 368,343
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Exercise of stock options, including income tax benefits |  |  |  | 6 | (123) |  |  |  |  |
Restricted stock transactions and other |  |  |  |  | (38,732) |  |  |  |  |
Share-based compensation |  |  |  |  | 25,041 |  |  |  |  |
Adjustments to acquisition valuation |  |  |  |  | (24,519) |  |  |  |  |
Net (loss) income for the period | $ 1,307,713 |  |  |  |  | 1,221,456 |  |  |  | 86,257
Cash dividends |  |  |  |  |  | (125,437) |  |  |  |
Foreign currency translation (loss) gain, net of income taxes | 36,927 |  |  |  |  |  |  | 36,927 |  |
Retirement and postretirement benefit plans, net of income taxes |  |  |  |  |  |  |  | 8,277 |  |
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes | 1,756 |  |  |  |  |  |  | 1,756 |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  | (405,938) |
Awarded restricted stock, net of forfeitures |  |  |  |  |  |  |  |  | 31,869 |
Acquisition closing adjustments |  |  |  |  |  |  |  |  |  | (7,920)
Distributions to noncontrolling interest owners |  |  |  |  |  |  |  |  |  | (97,510)
Balance at end of period at Sep. 30, 2019 | 6,025,820 | $ 5,676,650 | $ 0 | 195,083 | 941,309 | 6,726,316 |  | (562,827) | (1,623,231) | 349,170
Balance at beginning of period at Jun. 30, 2019 |  |  |  | 195,083 | 933,944 | 5,677,248 |  | (549,045) | (1,517,217) | 358,532
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 7,365 |  |  |  |  |
Net (loss) income for the period | 1,111,702 |  |  |  |  | 1,089,002 |  |  |  | 22,700
Cash dividends |  |  |  |  |  | (39,934) |  |  |  |
Foreign currency translation (loss) gain, net of income taxes | (17,128) |  |  |  |  |  |  | (17,128) |  |
Retirement and postretirement benefit plans, net of income taxes |  |  |  |  |  |  |  | 2,761 |  |
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes | 585 |  |  |  |  |  |  | 585 |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  | (106,014) |
Acquisition closing adjustments |  |  |  |  |  |  |  |  |  | (3,328)
Distributions to noncontrolling interest owners |  |  |  |  |  |  |  |  |  | (28,734)
Balance at end of period at Sep. 30, 2019 | 6,025,820 | 5,676,650 | 0 | 195,083 | 941,309 | 6,726,316 |  | (562,827) | (1,623,231) | 349,170
Balance at beginning of period at Dec. 31, 2019 | 5,804,611 |  |  | 195,089 | 949,445 | 6,614,304 |  | (574,161) | (1,717,217) | 337,151
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Exercise of stock options, including income tax benefits |  |  |  | 12 | (156) |  |  |  |  |
Restricted stock transactions and other |  |  |  |  | (33,649) |  |  |  |  |
Share-based compensation |  |  |  |  | 20,678 |  |  |  |  |
Net (loss) income for the period | (1,099,710) |  |  |  |  | (976,841) |  |  |  | (122,869)
Cash dividends |  |  |  |  |  | (76,790) |  |  |  |
Foreign currency translation (loss) gain, net of income taxes | (39,520) |  |  |  |  |  |  | (39,520) |  |
Retirement and postretirement benefit plans, net of income taxes |  |  |  |  |  |  |  | (45,219) |  |
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes | 905 |  |  |  |  |  |  | 905 |  |
Awarded restricted stock, net of forfeitures |  |  |  |  |  |  |  |  | 26,556 |
Distributions to noncontrolling interest owners |  |  |  |  |  |  |  |  |  | (43,673)
Balance at end of period at Sep. 30, 2020 | 4,514,045 | 4,343,436 | 0 | 195,101 | 936,318 | 5,560,673 |  | (657,995) | (1,690,661) | 170,609
Balance at beginning of period at Jun. 30, 2020 |  |  |  | 195,101 | 931,429 | 5,823,426 |  | (690,341) | (1,691,070) | 204,937
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restricted stock transactions and other |  |  |  |  | (409) |  |  |  |  |
Share-based compensation |  |  |  |  | 5,298 |  |  |  |  |
Net (loss) income for the period | (266,608) |  |  |  |  | (243,553) |  |  |  | (23,055)
Cash dividends |  |  |  |  |  | (19,200) |  |  |  |
Foreign currency translation (loss) gain, net of income taxes | 28,323 |  |  |  |  |  |  | 28,323 |  |
Retirement and postretirement benefit plans, net of income taxes |  |  |  |  |  |  |  | 3,726 |  |
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes | 297 |  |  |  |  |  |  | 297 |  |
Awarded restricted stock, net of forfeitures |  |  |  |  |  |  |  |  | 409 |
Distributions to noncontrolling interest owners |  |  |  |  |  |  |  |  |  | (11,273)
Balance at end of period at Sep. 30, 2020 | $ 4,514,045 | $ 4,343,436 | $ 0 | $ 195,101 | $ 936,318 | $ 5,560,673 |  | $ (657,995) | $ (1,690,661) | $ 170,609

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