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PARTNERS' CAPITAL - Change (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 26 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020
Increase (Decrease) in Partners's Capital |  |  |  |  |  |  |
Balance at beginning of period | $ 1,067,504 | $ 1,265,424 | $ 1,388,109 | $ 1,187,687 | $ 1,265,424 | $ 1,187,687 |
Balance at beginning of period (in units) |  | 126,915,597 |  |  | 126,915,597 |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) | (46,679) | $ (144,707) | 58,184 | 283,604 | $ (191,386) | 341,788 |
Actuarially determined long-term liability adjustments | 939 | 938 | (118) | (3,584) | 1,877 | (3,702) |
COMPREHENSIVE INCOME (LOSS) | (45,740) | (143,769) | 58,066 | 280,020 | (189,509) | 338,086 |
Settlement of deferred compensation plans |  | (1,310) |  | (7,817) |  |  |
Purchase of units under unit repurchase program |  |  |  | (5,251) |  |  | $ (93,500)
Common unit-based compensation | 1,610 | (527) | 3,021 | 2,743 |  |  |
Distributions on deferred common unit-based compensation |  | (986) | (799) | (1,280) |  |  |
Distributions from consolidated company to noncontrolling interest | (222) | (288) | (228) | (262) |  |  |
Distributions to Partners |  | (50,767) | (68,690) | (67,731) |  |  |
Other |  | (273) |  |  |  |  |
Balance at end of period | $ 1,023,152 | 1,067,504 | 1,379,479 | 1,388,109 | $ 1,023,152 | 1,379,479 | $ 1,023,152
Balance at end of period (in units) | 127,195,219 |  |  |  | 127,195,219 |  | 127,195,219
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Increase (Decrease) in Partners's Capital |  |  |  |  |  |  |
Balance at beginning of period | $ (77,055) | (77,993) | (50,455) | (46,871) | $ (77,993) | (46,871) |
Comprehensive income (loss): |  |  |  |  |  |  |
Actuarially determined long-term liability adjustments | 939 | 938 | (118) | (3,584) |  |  |
Balance at end of period | (76,116) | (77,055) | (50,573) | (50,455) | (76,116) | (50,573) | $ (76,116)
Noncontrolling Interest |  |  |  |  |  |  |
Increase (Decrease) in Partners's Capital |  |  |  |  |  |  |
Balance at beginning of period | 11,723 | 11,935 | 12,204 | 5,290 | 11,935 | 5,290 |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) | (15) | 76 | 114 | 7,176 |  |  |
Distributions from consolidated company to noncontrolling interest | (222) | (288) | (228) | (262) |  |  |
Balance at end of period | 11,486 | 11,723 | 12,090 | 12,204 | 11,486 | 12,090 | 11,486
Limited Partners' Capital |  |  |  |  |  |  |
Increase (Decrease) in Partners's Capital |  |  |  |  |  |  |
Balance at beginning of period | $ 1,132,836 | $ 1,331,482 | $ 1,426,360 | $ 1,229,268 | $ 1,331,482 | $ 1,229,268 |
Balance at beginning of period (in units) | 127,195,219 | 126,915,597 | 128,391,191 | 128,095,511 | 126,915,597 | 128,095,511 |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) | $ (46,664) | $ (144,783) | $ 58,070 | $ 276,428 |  |  |
Settlement of deferred compensation plans |  | $ (1,310) |  | $ (7,817) |  |  |
Settlement of deferred compensation plans (in units) |  | 279,622 |  | 596,650 |  |  |
Purchase of units under unit repurchase program |  |  |  | $ (5,251) |  |  |
Purchase of units under unit repurchase program (in units) |  |  |  | (300,970) |  |  |
Common unit-based compensation | 1,610 | $ (527) | 3,021 | $ 2,743 |  |  |
Distributions on deferred common unit-based compensation |  | (986) | (799) | (1,280) |  |  |
Distributions to Partners |  | (50,767) | (68,690) | (67,731) |  |  |
Other |  | (273) |  |  |  |  |
Balance at end of period | $ 1,087,782 | $ 1,132,836 | $ 1,417,962 | $ 1,426,360 | $ 1,087,782 | $ 1,417,962 | $ 1,087,782
Balance at end of period (in units) | 127,195,219 | 127,195,219 | 128,391,191 | 128,391,191 | 127,195,219 | 128,391,191 | 127,195,219

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