Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details)

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Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities $ (26,214) $ 14,249 $ 104,137
Other 740 1,054 121
Net cash used in investing activities (4,455) (8,191) (5,076)
Distributions to owners (57,821) (48,149) (163,249)
Proceeds from sale of partnership units 250,022 70,157 0
Net cash provided by financing activities 368,546 22,008 (163,254)
Net increase in cash and cash equivalents 337,877 28,066 (64,193)
Cash and cash equivalents—beginning of period 81,415 53,349 117,542
Cash and cash equivalents—end of period 419,292 81,415 53,349
Parent [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities (17,508) (13,948) (10,193)
Investment in subsidiaries (1,832,440) 0 (20,918)
Other 3 0 0
Net cash used in investing activities (1,832,437) 0 (20,918)
Proceeds from sale of Class B units 1,887,342 0 0
Distributions (to) received from affiliates, net 61,529 59,910 229,608
Distributions to owners (57,821) (48,149) (163,249)
Proceeds from sale of partnership units 250,021 70,157 0
Affiliate receivable 46,574 (38,333) (8,896)
Borrowings under long-term note—affiliate (874) 0 0
Net cash provided by financing activities 2,186,771 43,585 57,463
Net increase in cash and cash equivalents 336,826 29,637 26,352
Cash and cash equivalents—beginning of period 56,119 26,482 130
Cash and cash equivalents—end of period $ 392,945 $ 56,119 $ 26,482