Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 2,769	$ 234
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,196	29,672
Gain on sale of property	(98)	(19)
Deferred tax benefit	(738)	(1,028)
Non-cash stock-based compensation	2,564	2,255
Non-cash portion of derivatives loss	1,143	1,574
Amortization of debt issue costs	1,247	1,552
Amortization of discount on notes	474	474
Changes in assets and liabilities:
Accounts receivable, accrued revenue and other	34,949	3,551
Natural gas and natural gas liquids, prepaid expenses and other	(5,817)	(1,522)
Accounts payable, accrued gas purchases and other accrued liabilities	(57,642)	(35,011)
Net cash provided by operating activities	11,047	1,732
Cash flows from investing activities:
Additions to property and equipment	(36,269)	(21,596)
Proceeds from sale of property	121	47
Investment in limited liability company	(4,860)	0
Net cash used in investing activities	(41,008)	(21,549)
Cash flows from financing activities:
Proceeds from borrowings	169,000	84,250
Payments on borrowings	(115,000)	(68,250)
Payments on capital lease obligations	(762)	(723)
Increase (decrease) in drafts payable	(2,651)	6,302
Debt refinancing costs	(1,240)	(106)
Conversion of restricted stock, net of shares withheld for taxes	(734)	(785)
Distributions to non-controlling partners in the Partnership	(16,037)	(12,882)
Common dividends	(5,366)	(3,838)
Conversion of restricted units, net of units withheld for taxes	(980)	(1,328)
Proceeds from exercise of Partnership unit options	178	224
Net cash provided by financing activities	26,408	2,864
Net decrease in cash and cash equivalents	(3,553)	(16,953)
Cash and cash equivalents, beginning of period	30,343	22,780
Cash and cash equivalents, end of period	26,790	5,827
Cash paid for interest	34,183	33,693
Cash paid for income taxes	$ 0	$ 0