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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, 2017 $ 306,068 $ (929) $ 325,762 $ (18,765)
Beginning Balance, unit at Sep. 30, 2017   326 55,888  
Net income 30,182 $ 175 $ 30,007  
Unrealized gain on pension plan obligation 448     448
Tax effect of unrealized gain on pension plan (135)     (135)
Distributions (6,302) (154) (6,148)  
Ending Balance at Dec. 31, 2017 330,261 $ (908) $ 349,621 (18,452)
Ending Balance, Unit at Dec. 31, 2017   326 55,888  
Beginning Balance at Sep. 30, 2017 306,068 $ (929) $ 325,762 (18,765)
Beginning Balance, unit at Sep. 30, 2017   326 55,888  
Net income 84,960      
Unrealized gain on pension plan obligation [1] 896      
Tax effect of unrealized gain on pension plan (302)      
Unrealized gain (loss) on captive insurance collateral (931)      
Tax effect of unrealized gain (loss) on captive insurance collateral 196      
Ending Balance at Mar. 31, 2018 366,260 $ (743) $ 385,909 (18,906)
Ending Balance, Unit at Mar. 31, 2018   326 54,607  
Beginning Balance at Dec. 31, 2017 330,261 $ (908) $ 349,621 (18,452)
Beginning Balance, unit at Dec. 31, 2017   326 55,888  
Net income 54,778 $ 319 $ 54,459  
Unrealized gain on pension plan obligation 448 [1]     448
Tax effect of unrealized gain on pension plan (167)     (167)
Unrealized gain (loss) on captive insurance collateral (931)     (931)
Tax effect of unrealized gain (loss) on captive insurance collateral 196     196
Distributions (6,302) (154) (6,148)  
Retirement of units [2] (12,023)   $ (12,023)  
Retirement of units, shares [2]     (1,281)  
Ending Balance at Mar. 31, 2018 366,260 $ (743) $ 385,909 (18,906)
Ending Balance, Unit at Mar. 31, 2018   326 54,607  
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 2,315 15 2,300  
Unrealized gain on pension plan obligation 454     454
Tax effect of unrealized gain on pension plan (124)     (124)
Unrealized gain (loss) on captive insurance collateral 389     389
Tax effect of unrealized gain (loss) on captive insurance collateral (82)     (82)
Unrealized loss on interest rate hedges (745)     (745)
Tax effect of unrealized loss on interest rate hedges 197     197
Distributions (6,413) (188) (6,225)  
Retirement of units [2] (5,735)   $ (5,735)  
Retirement of units, shares [2]     (599)  
Ending Balance at Dec. 31, 2018 309,265 $ (1,416) $ 328,633 (17,952)
Ending Balance, Unit at Dec. 31, 2018   326 52,489  
Beginning Balance at Sep. 30, 2018 309,785 $ (1,303) $ 329,129 (18,041)
Beginning Balance, unit at Sep. 30, 2018   326 53,088  
Net income 74,640      
Unrealized gain on pension plan obligation [1] 911      
Tax effect of unrealized gain on pension plan (249)      
Unrealized gain (loss) on captive insurance collateral 1,294      
Tax effect of unrealized gain (loss) on captive insurance collateral (276)      
Unrealized loss on interest rate hedges (1,112)      
Tax effect of unrealized loss on interest rate hedges 292      
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 (125)     (125)
Unrealized gain (loss) on captive insurance collateral 905     905
Tax effect of unrealized gain (loss) 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  
[1] This item is included in the computation of net periodic pension cost.
[2] See Note 4 – Common Unit Repurchase and Retirement.