Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 64,367	$ 202,307
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	139,579	80,918
Amortization of intangible assets	31,922	23,292
Loss on redemption of debt	38,455
Amortization of deferred financing costs and discount	3,614	2,515
Accretion of asset retirement obligations	509	396
Amortization of deferred contract cost	156	156
Phantom unit compensation expense	7,298	8,585
Equity in earnings of unconsolidated affiliate	(665)	(1,548)
Distributions from unconsolidated affiliate	2,728	4,566
Unrealized gain on derivative instruments	(46,320)	(145,527)
(Gain) loss on disposal of property, plant and equipment	(37,598)	2,328
Deferred income taxes	30,999	28,868
Changes in operating assets and liabilities, net of working capital acquired:
Receivables	(34,529)	90,337
Inventories	(11,828)	18,895
Other current assets	607	2,638
Accounts payable and accrued liabilities	(7,462)	(71,783)
Other long-term assets	(21,751)	85
Other long-term liabilities	17,515	6,593
Net cash provided by operating activities	177,596	253,621
Cash flows from investing activities:
Restricted cash	25,500	1,003
Capital expenditures	(1,435,084)	(580,980)
Investment in unconsolidated affiliate	(8,336)	(839)
Acquisition of business, net of cash acquired	(225,210)	(506,797)
Proceeds from disposal of property, plant and equipment	208,109	499
Net cash flows used in investing activities	(1,435,021)	(1,087,114)
Cash flows from financing activities:
Proceeds from public equity offerings, net	348,352	852,873
Proceeds from Credit Facility		238,065
Payments of Credit Facility		(86,200)
Proceeds from long-term debt	1,000,000
Payments of long-term debt	(501,112)
Payments of premiums on redemption of long-term debt	(31,516)
Payments for debt issuance costs, deferred financing costs and registration costs	(14,046)	(2,315)
Contributions from non-controlling interest	685,219	1,101
Payments of SMR liability	(1,103)	(1,005)
Cash paid for taxes related to net settlement of share-based payment awards	(5,206)	(8,048)
Excess tax benefits related to share-based compensation	650	2,207
Payment of distributions to common unitholders	(214,903)	(155,073)
Payment of distributions to non-controlling interest	(112)	(71)
Net cash flows provided by financing activities	1,266,223	841,534
Net increase in cash and cash equivalents	8,798	8,041
Cash and cash equivalents at beginning of year	345,756	114,332
Cash and cash equivalents at end of period	$ 354,554	$ 122,373