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CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) $ in Thousands | Limited Partners' Capital | General Partner's Capital (Deficit) | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interest | Total
--- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 1,183,219 | $ 14,859 | $ (51,940) | $ 5,348 | $ 1,151,486
Balance at beginning of period (in units) at Dec. 31, 2017 | 130,704,217 |  |  |  |
Comprehensive income: |  |  |  |  |
Net income (loss) | $ 365,044 | 1,560 |  | 866 | 367,470
Actuarially determined long-term liability adjustments |  |  | 5,069 |  | 5,069
COMPREHENSIVE INCOME (LOSS) |  |  |  |  | 372,539
Settlement of deferred compensation plans | $ (2,745) |  |  |  | (2,745)
Settlement of deferred compensation plans (in units) | 199,039 |  |  |  |
Issuance of units to SGP in Exchange Transaction (in units) | 20,960 |  |  |  |
Issuance of units to Owners of SGP in Simplification Transactions | $ 14,742 | (15,106) |  |  | (364)
Issuance of units to Owners of SGP in Simplification Transactions (in units) | 1,322,388 |  |  |  |
Simplification Transactions fees | $ (96) |  |  |  | (96)
Contribution of units and cash by affiliated entity | $ 2,142 |  |  |  | 2,142
Contribution of units by affiliated entity (in units) | (467,018) |  |  |  |
Purchase of units under unit repurchase program | $ (70,604) |  |  |  | (70,604)
Purchase of units under unit repurchase program (in units) | (3,684,075) |  |  |  |
Common unit-based compensation | $ 12,114 |  |  |  | 12,114
Distributions on deferred common unit-based compensation | (3,855) |  |  |  | (3,855)
General Partners contributions |  | 41 |  |  | 41
Distributions from consolidated company to affiliate noncontrolling interest |  |  |  | (924) | (924)
Distributions to Partners | (270,693) | $ (1,354) |  |  | (272,047)
Balance at end of period at Dec. 31, 2018 | $ 1,229,268 |  | (46,871) | 5,290 | 1,187,687
Balance at end of period (in units) at Dec. 31, 2018 | 128,095,511 |  |  |  |
Comprehensive income: |  |  |  |  |
Net income (loss) | $ 399,414 |  |  | 7,512 | 406,926
Actuarially determined long-term liability adjustments |  |  | (31,122) |  | (31,122)
COMPREHENSIVE INCOME (LOSS) |  |  |  |  | 375,804
Settlement of deferred compensation plans | $ (7,817) |  |  |  | (7,817)
Settlement of deferred compensation plans (in units) | 596,650 |  |  |  |
Purchase of units under unit repurchase program | $ (22,892) |  |  |  | (22,892)
Purchase of units under unit repurchase program (in units) | (1,776,564) |  |  |  |
Common unit-based compensation | $ 11,934 |  |  |  | 11,934
Distributions on deferred common unit-based compensation | (3,670) |  |  |  | (3,670)
Distributions from consolidated company to affiliate noncontrolling interest |  |  |  | (867) | (867)
Distributions to Partners | (274,755) |  |  |  | (274,755)
Balance at end of period at Dec. 31, 2019 | $ 1,331,482 |  | (77,993) | 11,935 | $ 1,265,424
Balance at end of period (in units) at Dec. 31, 2019 | 126,915,597 |  |  |  | 126,915,597
Comprehensive income: |  |  |  |  |
Net income (loss) | $ (129,220) |  |  | 169 | $ (129,051)
Actuarially determined long-term liability adjustments |  |  | (9,681) |  | (9,681)
COMPREHENSIVE INCOME (LOSS) |  |  |  |  | (138,732)
Settlement of deferred compensation plans | $ (3,800) |  |  |  | (3,800)
Settlement of deferred compensation plans (in units) | 279,622 |  |  |  |
Common unit-based compensation | $ 3,345 |  |  |  | 3,345
Distributions on deferred common unit-based compensation | (986) |  |  |  | (986)
Distributions from consolidated company to affiliate noncontrolling interest |  |  |  | (728) | (728)
Distributions to Partners | (50,767) |  |  |  | (50,767)
Other | (1,489) |  |  |  | (1,489)
Balance at end of period at Dec. 31, 2020 | $ 1,148,565 |  | $ (87,674) | $ 11,376 | $ 1,072,267
Balance at end of period (in units) at Dec. 31, 2020 | 127,195,219 |  |  |  | 127,195,219

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