Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net (loss) income	$ (80,871)	$ 28,964
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	241,501	206,007
Amortization of intangible assets	31,422	31,943
Impairment expense	25,523
Loss on redemption of debt	117,860
Amortization of deferred financing costs and debt discount	3,197	4,273
Accretion of asset retirement obligations	387	336
Amortization of deferred contract cost	52	1,025
Phantom unit compensation expense	10,387	9,955
Equity in (earnings) loss from unconsolidated affiliates	(3,774)	471
Distributions from unconsolidated affiliates	28,747	3,910
Unrealized loss on derivative instruments	15,520	7,024
Loss on disposal of property, plant and equipment	1,606	1,357
Deferred income taxes	(15,741)	9,280
Changes in operating assets and liabilities:
Receivables	28,625	(32,291)
Receivables from unconsolidated affiliates	1,749	2,768
Inventories	837	(21,435)
Other current assets	20,109	7,434
Accounts payable and accrued liabilities	(62,136)	87,371
Payables to unconsolidated affiliates	3,388
Other long-term assets	16	761
Other long-term liabilities	(5,066)	7,670
Net cash flows provided by operating activities	363,338	356,823
Cash flows from investing activities:
Restricted cash	10,000
Capital expenditures	(833,062)	(1,275,323)
Investment in unconsolidated affiliates	(107,894)	(76,054)
Proceeds from sale of equity interest in unconsolidated affiliate		324,657
Proceeds from disposal of property, plant and equipment	2,360	21,562
Net cash flows used in investing activities	(928,596)	(1,005,158)
Cash flows from financing activities:
Proceeds from public equity offerings, net	39,630	711,837
Proceeds from Credit Facility	1,260,600	1,923,500
Payments of Credit Facility	(910,700)	(1,482,300)
Proceeds from long-term debt	1,848,875
Payments of long-term debt	(1,280,000)
Payments of premiums on redemption of long-term debt	(103,209)
Payments for debt issuance costs, deferred financing costs and registration costs	(20,270)	(2,045)
Proceeds from sale of equity interest in joint venture	11,319
Contributions from non-controlling interest	26,689
Payments of SMR liability	(1,319)	(1,201)
Cash paid for taxes related to net settlement of share-based payment awards	(6,117)	(8,943)
Payment of distributions to common unitholders	(339,306)	(278,316)
Payment of distributions to non-controlling interest	(24,659)	(90)
Net cash flows provided by financing activities	501,533	862,442
Net (decrease) increase in cash and cash equivalents	(63,725)	214,107
Cash and cash equivalents at beginning of period	108,887	85,305
Cash and cash equivalents at end of period	$ 45,162	$ 299,412