Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net income	$ 137,997	$ 131,123
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	175,520	138,519
Income from unconsolidated affiliates	(90,941)	(58,753)
Other non-cash items	12,602	6,676
Distribution of earnings received from unconsolidated affiliates	155,358
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	46,309	(23,592)
(Increase) decrease in other assets	(5,312)	1,905
Increase (decrease) in accounts payable	25,733	(10,896)
Increase in accrued liabilities	5,495	32,598
Net cash provided by operating activities	462,761	217,580
Cash flows from investing activities
Additions to property, plant and equipment	(521,170)	(545,594)
Purchase of compression assets	(159,210)
Investments in unconsolidated affiliates	(220,378)	(263,710)
Proceeds from sale of assets	14,296	31,696
Net cash used in investing activities	(886,462)	(777,608)
Cash flows from financing activities
Proceeds from long-term borrowings	1,053,471	875,500
Payments on long-term debt borrowings	(1,246,971)	(659,300)
Proceeds from issuance of common units	52,155	399,922
Proceeds from issuance of senior notes	750,000
Distributions to unitholders	(252,145)	(177,430)
Capital contributions from noncontrolling interests	95,441	71,414
Payments on capital lease obligations	(1,983)
Debt issuance costs	(8,777)	(5,377)
Other	1,956	8,328
Net cash provided by financing activities	443,147	513,057
Net increase (decrease) in cash and cash equivalents	19,446	(46,971)
Cash and cash equivalents, beginning of period	17,229	64,994
Cash and cash equivalents, end of period	36,675	18,023
Supplemental disclosure of non-cash investing activities
Changes in accounts payable and other liabilities related to purchases of property, plant and equipment	33,566	(25,244)
Changes in other liabilities related to asset retirement obligations	$ 1,016	$ 105