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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities $ 5,748 $ 11,928 $ 35,664
Cash flows from investing activities      
Purchase of Creole Trail Pipeline Business, net 0 0 (313,892)
Net cash provided by (used in) investing activities (9,051) (15,101) (328,800)
Cash flows from financing activities      
Distributions to owners (99,018) (98,979) (91,386)
Proceeds from sale of partnership common and general partner units 0 0 375,897
Net cash provided by (used in) financing activities (99,306) (99,029) 224,876
Net decrease in cash and cash equivalents (102,609) (102,202) (68,260)
Cash and cash equivalents—beginning of period 248,830 351,032 419,292
Cash and cash equivalents—end of period 146,221 248,830 351,032
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities 3,646 (24,416) (13,056)
Cash flows from investing activities      
Investments in subsidiaries (35,208) (77,846) (405,452)
Distributions received from affiliates, net 18,400 108,625 369,726
Purchase of Creole Trail Pipeline Business, net 0 0 (313,892)
Net cash provided by (used in) investing activities (16,808) 30,779 (349,618)
Cash flows from financing activities      
Distributions to owners (99,018) (99,015) (91,386)
Proceeds from sale of partnership common and general partner units 0 0 375,897
Net cash provided by (used in) financing activities (99,018) (99,015) 284,511
Net decrease in cash and cash equivalents (112,180) (92,652) (78,163)
Cash and cash equivalents—beginning of period 222,130 314,782 392,945
Cash and cash equivalents—end of period $ 109,950 $ 222,130 $ 314,782