Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 210,334	$ 154,200
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	215,605	120,323
Income from unconsolidated affiliates	(91,588)	(44,682)
Other non-cash items	8,781	5,661
Distribution of earnings received from unconsolidated affiliates	4,737
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(42,218)	12,547
(Increase) decrease in other assets	1,721	(15,289)
Decrease in accounts payable	(12,595)	(6,579)
Increase in accrued liabilities	63,229	16,492
Net cash provided by operating activities	358,006	242,673
Cash flows from investing activities:
Additions to property, plant and equipment	(811,111)	(231,632)
Investments in unconsolidated affiliates	(425,298)	(139,216)
Proceeds from sale of assets	72,408	9,316
Net cash used in investing activities	(1,164,001)	(361,532)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	1,445,500	847,500
Payments on long-term debt borrowings	(1,340,700)	(1,285,900)
Proceeds from issuance of common units	399,812
Proceeds from issuance of senior notes	414,094	750,000
Distributions to unitholders	(275,199)	(184,639)
Capital contributions from noncontrolling interests	120,594
Debt issuance costs	(11,735)	(13,824)
Other adjustments	8,598	5,720
Net cash provided by financing activities	760,964	118,857
Net decrease in cash and cash equivalents	(45,031)	(2)
Cash and cash equivalents, beginning of period	64,994	22
Cash and cash equivalents, end of period	19,963	20
Supplemental disclosure of non-cash investing activities:
Changes in accounts payable and other liabilities related to purchases of property, plant and equipment	(8,858)	14,855
Changes in other liabilities related to asset retirement obligations	$ (1,632)	$ 133