Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and cash equivalents	$ 236,284	$ 108,887
Receivables, net	264,125	302,259
Receivables from unconsolidated affiliates, net	5,669	7,097
Inventories	27,718	31,749
Other current assets	34,754	46,731
Property, plant and equipment	10,259,868	9,923,524
Less: accumulated depreciation	(1,370,931)	(1,270,624)
Investment in unconsolidated affiliates	838,766	805,633
Accumulated amortization, intangibles	355,715	350,327
Accumulated amortization, deferred financing costs	32,984	31,298
Accumulated amortization, deferred contract cost	3,250	3,198
Other long-term assets	3,452	3,426
Accounts payable	233,929	270,997
Accrued liabilities	273,750	360,006
Payables to unconsolidated affiliates	11,295	8,621
Long-term debt, (premiums) and discounts	(4,463)	6,196
Common Units
Common units issued (in units)	186,751	186,553
Common units outstanding (in units)	186,751	186,553
Class B Units
Common units issued (in units)	11,973	11,973
Common units outstanding (in units)	11,973	11,973
Total Variable Interest Entities
Cash and cash equivalents	98,032	73,300
Receivables, net	18,542	22,722
Receivables from unconsolidated affiliates, net	0	30
Inventories	2,922	2,434
Other current assets	6,472	9,511
Property, plant and equipment	1,461,209	1,411,797
Less: accumulated depreciation	(72,383)	(56,987)
Investment in unconsolidated affiliates	724,284	696,784
Other long-term assets	664	664
Accounts payable	28,246	28,021
Accrued liabilities	16,426	48,793
Payables to unconsolidated affiliates	$ 8,774	$ 5,500