Quarterly report pursuant to Section 13 or 15(d)

Cash Distributions and Net Income (Loss) per Common Unit (Details)

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Cash Distributions and Net Income (Loss) per Common Unit (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss $ (42,487) $ (19,332)
Declared distributions 24,754 13,499
Assumed allocation of undistributed net loss (67,241) (32,831)
Weighted average units outstanding (shares)   31,017
Net income (loss) per common unit (US$ per share)   $ 0.23
Subordinated Units
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss (30,707)  
Declared distributions 0 0
Assumed allocation of undistributed net loss (46,353) (26,160)
Assumed allocation of net income (loss) (46,353) (26,160)
Weighted average units outstanding (shares) 135,384 135,384
Net income (loss) per common unit (US$ per share) $ (0.34) $ (0.19)
Class B Unit [Member]
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss 0  
Declared distributions 0 0
Assumed allocation of undistributed net loss 0 0
Assumed allocation of net income (loss) 0 0
Weighted average units outstanding (shares) 133,333 0
Net income (loss) per common unit (US$ per share) $ 0.00 $ 0.00
General Partner [Member]
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss (1,449)  
Declared distributions 495 270
Assumed allocation of undistributed net loss (1,345) (656)
Assumed allocation of net income (loss) (850) (386)
Common Units
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss (10,331)  
Declared distributions 24,259 13,229
Assumed allocation of undistributed net loss (19,543) (6,015)
Assumed allocation of net income (loss) $ 4,716 $ 7,214
Weighted average units outstanding (shares) 45,547 31,017
Net income (loss) per common unit (US$ per share) $ 0.10 $ 0.23