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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss $ (24,861) $ (6,868) $ (44,193) $ (9,078)
Declared distributions 13,612 11,679 27,207 23,246
Amortization of beneficial conversion feature of Class B units 0   0  
Assumed allocation of undistributed net loss (38,473) (18,547) (71,400) (32,324)
Weighted average units outstanding 31,328 26,754    
Net income (loss) per unit $ 0.17 $ 0.32 $ 0.40 $ 0.66
Common Units
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     (8,091)  
Declared distributions 13,340 11,446 26,663 22,781
Amortization of beneficial conversion feature of Class B units (892)   (892)  
Assumed allocation of undistributed net loss (7,096) (3,016) (13,169) (5,256)
Assumed allocation of net income (loss) 5,352 8,430 12,602 17,525
Weighted average units outstanding     31,173 26,592
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 4,737   4,737  
Assumed allocation of undistributed net loss 0 0 0 0
Assumed allocation of net income (loss) 4,737 0 4,737 0
Weighted average units outstanding 2,442 0 1,221 0
Net income (loss) per unit $ 1.94 $ 0.00 $ 3.88 $ 0.00
Subordinated Units
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     (35,215)  
Declared distributions           
Amortization of beneficial conversion feature of Class B units (3,845)   (3,845)  
Assumed allocation of undistributed net loss (30,608) (15,161) (56,803) (26,422)
Assumed allocation of net income (loss) (34,453) (15,161) (60,648) (26,422)
Weighted average units outstanding 135,384 135,384 135,384 135,384
Net income (loss) per unit $ (0.25) $ (0.11) $ (0.45) $ (0.20)
General Partner
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss     (887)  
Declared distributions 272 234 544 0
Amortization of beneficial conversion feature of Class B units 0   0  
Assumed allocation of undistributed net loss (769) (371) (1,428) (646)
Assumed allocation of net income (loss) $ (497) $ (137) $ (884) $ (646)