Quarterly report pursuant to Section 13 or 15(d)

Cash Distributions and Net Income (Loss) per Common Unit - Reconciliation of Net income (Loss) per Common Unit (Details)

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Cash Distributions and Net Income (Loss) per Common Unit - Reconciliation of Net income (Loss) per Common Unit (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss $ (42,422) $ (14,479) $ (86,615) $ (23,557)
Declared distributions 17,125 13,445 44,376 36,691
Amortization of beneficial conversion feature of Class B units 0   0  
Assumed allocation of undistributed net loss (59,547) (27,924) (130,991) (60,248)
Weighted average units outstanding 31,997 27,408    
Net income (loss) per unit $ 0.04 $ 0.29 $ 0.36 $ 0.93
Common Units
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     (15,398)  
Declared distributions 16,783 13,176 43,488 35,957
Amortization of beneficial conversion feature of Class B units (2,971)   (3,863)  
Assumed allocation of undistributed net loss (12,467) (5,099) (28,278) (11,002)
Assumed allocation of net income (loss) 1,345 8,077 11,347 24,955
Weighted average units outstanding     31,449 26,867
Capital Unit, Class B
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     0  
Amortization of beneficial conversion feature of Class B units 14,888   19,625  
Assumed allocation of undistributed net loss 0 0 0 0
Assumed allocation of net income (loss) 14,888 0 19,625 0
Weighted average units outstanding 54,710 0 19,181 0
Net income (loss) per unit $ 0.27 $ 0.00 $ 1.02 $ 0.00
Subordinated Units
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     (66,131)  
Declared distributions           
Amortization of beneficial conversion feature of Class B units (11,917)   (15,762)  
Assumed allocation of undistributed net loss (42,744) (22,267) (96,948) (48,041)
Assumed allocation of net income (loss) (54,661) (22,267) (112,710) (48,041)
Weighted average units outstanding 135,384 135,384 135,384 135,384
Net income (loss) per unit $ (0.40) $ (0.16) $ (0.83) $ (0.35)
General Partner
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     (5,086)  
Declared distributions 342 269 888 734
Amortization of beneficial conversion feature of Class B units 0   0  
Assumed allocation of undistributed net loss (4,336) (558) (5,765) (1,205)
Assumed allocation of net income (loss) $ (3,994) $ (289) $ (4,877) $ (471)