Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 15,916	$ (21,131)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	101,929	68,017
Amortization of intangible assets	15,978	14,830
Loss on redemption of debt		38,455
Amortization of deferred financing costs and debt discount	2,824	1,830
Accretion of asset retirement obligations	168	352
Amortization of deferred contract cost	875	78
Phantom unit compensation expense	6,043	4,002
Equity in earnings from unconsolidated affiliates	(250)	(235)
Distributions from unconsolidated affiliates	1,369	766
Unrealized gain on derivative instruments	(11,820)	(9,033)
(Gain) loss on disposal of property, plant and equipment	(93)	138
Deferred income taxes	12,201	11,971
Changes in operating assets and liabilities:
Receivables	(3,132)	(13,818)
Inventories	(6,303)	4,119
Other current assets	1,922	10,932
Accounts payable and accrued liabilities	(29,798)	(30,500)
Other long-term assets	460	33
Other long-term liabilities	4,084	2,952
Net cash provided by operating activities	112,373	83,758
Cash flows from investing activities:
Restricted cash		25,000
Capital expenditures	(587,120)	(631,558)
Investment in unconsolidated affiliates	(7,498)	(3,012)
Proceeds from disposal of property, plant and equipment	19,144	209
Net cash flows used in investing activities	(575,474)	(609,361)
Cash flows from financing activities:
Proceeds from public equity offerings, net	271,880	103,937
Proceeds from Credit Facility	377,300
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	(1,890)	(14,046)
Contributions from non-controlling interest		385,219
Payments of SMR liability	(594)	(545)
Cash paid for taxes related to net settlement of share-based payment awards	(8,924)	(5,206)
Excess tax benefits related to share-based compensation		651
Payment of distributions to common unitholders	(136,405)	(105,945)
Payment of distributions to non-controlling interest	(90)	(81)
Net cash flows provided by financing activities	501,277	831,356
Net increase in cash and cash equivalents	38,176	305,753
Cash and cash equivalents at beginning of year	85,305	345,756
Cash and cash equivalents at end of period	$ 123,481	$ 651,509