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Owners' Equity (Changes In Owners' Equity) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Schedule of Capitalization, Equity [Line Items]    
Balance, January 1, 2011  $ 1,469,571 
Net income (loss)110,24056,637303,304223,623
Net gain on commodity hedges6,539(179)11,152(468)
Reclassification of net gain on interest rate cash flow hedges to interest expense(41)(41)(123)(123)
Reclassification of net gain on commodity hedges to product sales revenues(1,493)(1,068)(1,493)967
Settlement cost and amortization of prior service credit and actuarial loss70110185680
Adjustment to recognize the funded status of postretirement plans(10,254)(2,167)(10,254)(2,167)
Total comprehensive income (loss)105,69253,283303,442221,912
Distributions  (260,703)(235,019)
Equity method portion of equity-based incentive compensation expense  7,738 
Issuance of 255,222 common units in settlement of long-term incentive plan awards and board of director retainer fees  4,315 
Settlement of tax withholdings on long-term incentive compensation  (7,410)(3,371)
Acquisition of non-controlling owners' interest  (40,500) 
Other  (125) 
Balance, September 30, 20111,476,328 1,476,328 
Issuance of common units255,222 255,222 
Limited Partners' Capital [Member]
    
Schedule of Capitalization, Equity [Line Items]    
Balance, January 1, 2011  1,466,404 
Net income (loss)  303,367 
Net gain on commodity hedges    
Reclassification of net gain on interest rate cash flow hedges to interest expense    
Reclassification of net gain on commodity hedges to product sales revenues    
Settlement cost and amortization of prior service credit and actuarial loss    
Adjustment to recognize the funded status of postretirement plans    
Total comprehensive income (loss)  303,367 
Distributions  (260,703) 
Equity method portion of equity-based incentive compensation expense  7,738 
Issuance of 255,222 common units in settlement of long-term incentive plan awards and board of director retainer fees  4,315 
Settlement of tax withholdings on long-term incentive compensation  (7,410) 
Acquisition of non-controlling owners' interest  (26,300) 
Other  (125) 
Balance, September 30, 20111,487,286 1,487,286 
Limited Partners' Accumulated Other Comprehensive Loss [Member]
    
Schedule of Capitalization, Equity [Line Items]    
Balance, January 1, 2011  (11,096) 
Net income (loss)    
Net gain on commodity hedges  11,152 
Reclassification of net gain on interest rate cash flow hedges to interest expense  (123) 
Reclassification of net gain on commodity hedges to product sales revenues  (1,493) 
Settlement cost and amortization of prior service credit and actuarial loss  856 
Adjustment to recognize the funded status of postretirement plans  (10,254) 
Total comprehensive income (loss)  138 
Distributions    
Equity method portion of equity-based incentive compensation expense    
Settlement of tax withholdings on long-term incentive compensation    
Acquisition of non-controlling owners' interest    
Other    
Balance, September 30, 2011(10,958) (10,958) 
Non-Controlling Owners' Interest [Member]
    
Schedule of Capitalization, Equity [Line Items]    
Balance, January 1, 2011  14,263 
Net income (loss)  (63) 
Net gain on commodity hedges    
Reclassification of net gain on interest rate cash flow hedges to interest expense    
Reclassification of net gain on commodity hedges to product sales revenues    
Settlement cost and amortization of prior service credit and actuarial loss    
Adjustment to recognize the funded status of postretirement plans    
Total comprehensive income (loss)  (63) 
Distributions    
Equity method portion of equity-based incentive compensation expense    
Issuance of 255,222 common units in settlement of long-term incentive plan awards and board of director retainer fees    
Settlement of tax withholdings on long-term incentive compensation    
Acquisition of non-controlling owners' interest  (14,200) 
Other    
Balance, September 30, 2011