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Segement Information (Tables)
3 Months Ended
Mar. 31, 2013
Segment Reporting [Abstract]  
Partnership Reportable Segement
    LIG NTX PNGL ORV Corporate Totals 
    (In thousands) 
Three Months Ended March 31, 2013:              
 Sales to external customers  $ 133,057 $ 73,450 $ 183,923 $ 55,259 $ -  $ 445,689 
 Sales to affiliates  $ 29,786 $ 16,363 $ 16,427 $ -  $ (62,576) $ -  
 Purchased gas, NGLs and crude oil $ (140,633) $ (46,118) $ (175,783) $ (41,064) $ 62,576 $ (341,022) 
 Operating expenses  $ (7,661) $ (14,172) $ (7,218) $ (8,285) $ -  $ (37,336) 
 Segment profit  $ 14,549 $ 29,523 $ 17,349 $ 5,910 $ -  $ 67,331 
 Gain (loss) on derivatives  $ 373 $ (775) $ (70) $ -  $ -  $ (472) 
 Depreciation, amortization                   
   and impairments  $ (3,139) $ (19,791) $ (7,975) $ (2,342) $ (498) $ (33,745) 
 Capital expenditures  $ 8,232 $ 5,023 $ 96,166 $ 15,246 $ 4,954 $ 129,621 
 Identifiable assets  $ 286,273 $ 1,034,580 $ 708,989 $ 327,648 $ 155,144 $ 2,512,634 
Three Months Ended March 31, 2012:                   
 Sales to external customers  $ 146,697 $ 64,681 $ 160,331 $ -  $ -  $ 371,709 
 Sales to affiliates    72,810   31,484   45,545   -    (149,839)   -  
 Gas and NGL marketing activities                    
 Purchased gas, NGLs and crude oil   (189,220)   (50,021)   (182,554)   -    149,839   (271,956) 
 Operating expenses    (7,936)   (13,151)   (6,719)   -    -    (27,806) 
 Segment profit  $ 22,351 $ 32,993 $ 16,603 $ -  $ -  $ 71,947 
 Gain (loss) on derivatives  $ 102 $ (2,263) $ (8) $ -  $ -  $ (2,169) 
 Depreciation, amortization and                   
  impairments $ (3,172) $ (20,433) $ (7,959) $ -  $ (634) $ (32,198) 
 Capital expenditures  $ 8 $ 13,156 $ 15,662 $ -  $ 454 $ 29,280 
 Identifiable assets  $ 287,879 $ 1,092,530 $ 463,250 $ -  $ 86,890 $ 1,930,549 
Segment Table reconciliation to Condensed Consolidated Financial Statement
 The following table reconciles the segment profits reported above to the operating income as reported in the condensed 
consolidated statements of operations (in thousands): 
         
   Three Months Ended 
   March 31, 
         
   2013 2012 
Segment profits  $ 67,331 $ 71,947 
General and administrative expenses    (18,973)   (15,606) 
Loss on derivatives    (472)   (2,169) 
Gain (loss) on sale of property    (11)   98 
Depreciation, amortization and impairments    (33,745)   (32,196) 
Operating income  $ 14,130 $ 22,074