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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