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Condensed Consolidated Statements of Changes in Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Units
Class B Units
Non-controlling Interest
Redeemable Non-controlling Interest (Temporary Equity)
Balance at Dec. 31, 2011 $ 1,395,242 $ 642,522 $ 752,531 $ 189  
Balance (in units) at Dec. 31, 2011   94,940 19,954    
Increase (Decrease) in Equity          
Issuance of units in public offerings, net of offering costs 1,191,066 1,191,066      
Issuance of units in public offerings, net of offering costs (in units)   22,408      
Distributions paid (244,240) (244,169)   (71)  
Contributions from non-controlling interest 56,101     56,101  
Share-based compensation activity 3,517 3,517      
Share-based compensation activity (in units)   246      
Excess tax benefits related to share-based compensation 2,216 2,216      
Deferred income tax impact from changes in equity (75,248) (75,248)      
Net income (loss) 187,042 188,588   (1,546)  
Balance at Sep. 30, 2012 2,515,696 1,708,492 752,531 54,673  
Balance (in units) at Sep. 30, 2012   117,594 19,954    
Balance at Dec. 31, 2012 3,111,398 2,097,404 752,531 261,463  
Balance (in units) at Dec. 31, 2012   127,494 19,954    
Increase (Decrease) in Equity          
Issuance of units in public offerings, net of offering costs 1,039,849 1,039,849      
Issuance of units in public offerings, net of offering costs (in units) 0 16,112      
Conversion of Class B units to common units   150,506 (150,506)    
Conversion of Class B units to common units (in shares)   3,990 (3,990)    
Distributions paid (334,126) (333,946)   (180)  
Contributions from non-controlling interest 685,219     685,219  
Redeemable non-controlling interest classified as temporary equity (366,238)     (366,238) 366,238
Share-based compensation activity 6,697 6,697      
Share-based compensation activity (in units)   167      
Excess tax benefits related to share-based compensation 650 650      
Deferred income tax impact from changes in equity (37,346) (37,346)      
Net income (loss) 44,340 44,637   (297)  
Balance at Sep. 30, 2013 366,238        
Balance at Sep. 30, 2013 $ 4,150,443 $ 2,968,451 $ 602,025 $ 579,967  
Balance (in units) at Sep. 30, 2013   147,763 15,964