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CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($)
shares in Thousands, $ in Thousands
Total
General Partner
Common Stock
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Sep. 30, 2018 $ 309,785 $ (1,303) $ 329,129 $ (18,041)
Beginning Balance, unit at Sep. 30, 2018   326 53,088  
Impact from adoption of ASU No. 2014-09 9,224 $ 60 $ 9,164  
Net income 74,640 469 74,171  
Unrealized gain on pension plan obligation 911 [1]     911
Tax effect of unrealized gain on pension plan obligation (249)     (249)
Unrealized gain on captive insurance collateral 1,294     1,294
Tax effect of unrealized gain on captive insurance collateral (276)     (276)
Unrealized loss on interest rate hedges (1,112)     (1,112)
Tax effect of unrealized loss on interest rate hedges 292     292
Distributions (12,717) (372) (12,345)  
Retirement of units [2] (26,371)   $ (26,371)  
Retirement of units, shares [2]     (2,786)  
Ending Balance at Mar. 31, 2019 355,421 $ (1,146) $ 373,748 (17,181)
Ending Balance, Unit at Mar. 31, 2019   326 50,302  
Beginning Balance at Dec. 31, 2018 309,265 $ (1,416) $ 328,633 (17,952)
Beginning Balance, unit at Dec. 31, 2018   326 52,489  
Net income 72,325 $ 454 $ 71,871  
Unrealized gain on pension plan obligation 457 [1]     457
Tax effect of unrealized gain on pension plan obligation (125)     (125)
Unrealized gain on captive insurance collateral 905     905
Tax effect of unrealized gain on captive insurance collateral (194)     (194)
Unrealized loss on interest rate hedges (367)     (367)
Tax effect of unrealized loss on interest rate hedges 95     95
Distributions (6,304) (184) (6,120)  
Retirement of units [2] (20,636)   $ (20,636)  
Retirement of units, shares [2]     (2,187)  
Ending Balance at Mar. 31, 2019 355,421 $ (1,146) $ 373,748 (17,181)
Ending Balance, Unit at Mar. 31, 2019   326 50,302  
Beginning Balance at Sep. 30, 2019 260,840 $ (1,968) $ 279,709 (16,901)
Beginning Balance, unit at Sep. 30, 2019   326 47,685  
Ending Balance at Dec. 31, 2019 270,898 $ (1,991) $ 289,268 (16,379)
Ending Balance, Unit at Dec. 31, 2019   326 46,404  
Beginning Balance at Sep. 30, 2019 260,840 $ (1,968) $ 279,709 (16,901)
Beginning Balance, unit at Sep. 30, 2019   326 47,685  
Net income 86,163 $ 601 $ 85,562  
Unrealized gain on pension plan obligation 910 [1]     910
Tax effect of unrealized gain on pension plan obligation (258)     (258)
Unrealized gain on captive insurance collateral 43     43
Tax effect of unrealized gain on captive insurance collateral (7)     (7)
Unrealized loss on interest rate hedges (1,382)     (1,382)
Tax effect of unrealized loss on interest rate hedges 374     374
Distributions (12,153) (425) (11,728)  
Retirement of units [2] (18,575)   $ (18,575)  
Retirement of units, shares [2]     (2,063)  
Ending Balance at Mar. 31, 2020 315,955 $ (1,792) $ 334,968 (17,221)
Ending Balance, Unit at Mar. 31, 2020   326 45,622  
Beginning Balance at Dec. 31, 2019 270,898 $ (1,991) $ 289,268 (16,379)
Beginning Balance, unit at Dec. 31, 2019   326 46,404  
Net income 58,408 $ 409 $ 57,999  
Unrealized gain on pension plan obligation 455 [1]     455
Tax effect of unrealized gain on pension plan obligation (133)     (133)
Unrealized gain on captive insurance collateral 107     107
Tax effect of unrealized gain on captive insurance collateral (15)     (15)
Unrealized loss on interest rate hedges (1,716)     (1,716)
Tax effect of unrealized loss on interest rate hedges 460     460
Distributions (5,998) (210) (5,788)  
Retirement of units [2] (6,511)   $ (6,511)  
Retirement of units, shares [2]     (782)  
Ending Balance at Mar. 31, 2020 $ 315,955 $ (1,792) $ 334,968 $ (17,221)
Ending Balance, Unit at Mar. 31, 2020   326 45,622  
[1] This item is included in the computation of net periodic pension cost.
[2] See Note 4 – Common Unit Repurchase and Retirement.