CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 40,445	$ 216,965	$ 104,800
Adjustments to reconcile net income to net cash provided by operating activities (net of acquisitions):
Depreciation	299,884	183,250	143,704
Amortization of intangible assets	64,644	53,320	43,617
Loss on redemption of debt	38,455		78,996
Amortization of deferred financing costs and discount	6,726	5,601	5,114
Accretion of asset retirement obligations	824	672	1,185
Amortization of deferred contract cost	312	312	312
Phantom unit compensation expense	16,282	14,615	13,479
Equity in earnings of unconsolidated affiliates	(1,422)	(2,328)	(158)
Contributions to unconsolidated affiliate			(560)
Distributions from unconsolidated affiliates	6,370	8,416	4,382
Unrealized loss (gain) on derivative instruments	15,602	(102,127)	4,147
(Loss) gain on disposal of property, plant and equipment	(33,763)	6,254	8,797
Deferred income taxes	23,877	40,694	(3,929)
Other			1,626
Changes in operating assets and liabilities, net of working capital acquired:
Receivables	(85,927)	31,993	(45,107)
Inventories	(16,730)	16,580	(16,025)
Other current assets	(9,197)	(23,285)	(3,557)
Accounts payable and accrued liabilities	68,070	28,417	54,795
Other long-term assets	(21,747)	(647)	(308)
Other long-term liabilities	22,945	13,311	15,093
Net cash provided by operating activities	435,650	492,013	410,403
Cash flows from investing activities:
Restricted cash	15,500	(9,497)	2,006
Capital expenditures	(3,046,956)	(1,950,324)	(550,839)
Acquisition of business, net of cash acquired	(222,888)	(506,797)	(230,728)
Investment in unconsolidated affiliates	(17,521)	(6,066)
Proceeds from disposal of property, plant and equipment	209,303	596	3,450
Net cash flows used in investing activities	(3,062,562)	(2,472,088)	(776,111)
Cash flows from financing activities:
Proceeds from public equity offerings, net	1,698,066	1,634,081	1,095,488
Proceeds from Credit facility		511,100	1,182,200
Payments of Credit facility		(577,100)	(1,116,200)
Proceeds from long-term debt	1,000,000	742,613	1,199,000
Payments of long-term debt	(501,112)		(693,888)
Payments of premiums on redemption of long-term debt	(31,516)		(71,377)
Payments for debt issuance costs, deferred financing costs and registration costs	(14,046)	(14,720)	(20,163)
Acquisition of non-controlling interest, including transaction costs			(997,601)
Contributions from non-controlling interest	685,219	264,781	126,392
Payments of SMR Liability	(2,241)	(2,058)	(1,875)
Cash paid for taxes related to net settlement of share-based payment awards	(5,210)	(8,067)	(6,354)
Excess tax benefits related to share-based compensation		907	1,084
Payment of distributions to common unitholders	(462,488)	(339,967)	(218,398)
Payment of distributions to non-controlling interest	(211)	(71)	(62,805)
Net cash flows provided by financing activities	2,366,461	2,211,499	415,503
Net (decrease) increase in cash and cash equivalents	(260,451)	231,424	49,795
Cash and cash equivalents at beginning of year	345,756	114,332	64,537
Cash and cash equivalents at end of year	$ 85,305	$ 345,756	$ 114,332