Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 66,515	$ 127,913
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and accretion	164,861	149,968
Impairment expense	49,063	31,531
Deferred income tax expense	50,960	71,569
Non-cash gain from hedging and derivative activities	(50,550)	(45,801)
Stock-based compensation	15,475	17,343
Non-cash interest expense	13,109	13,372
Gain on disposition of BBEP Units	(133,248)	(49,850)
(Income) loss from BBEP in excess of cash distributions	49,065	(9,416)
Other	(897)	(337)
Changes in assets and liabilities
Accounts receivable	2,101	25,101
Derivative assets at fair value		30,816
Prepaid expenses and other assets	(20,791)	4,974
Accounts payable	(29,430)	(18,793)
Accrued and other liabilities	(1,567)	(1,000)
Net cash provided by operating activities	174,666	347,390
Investing activities:
Capital expenditures	(550,954)	(494,338)
Proceeds from sale of BBEP Units	145,799	22,498
Proceeds from sale of properties and equipment	3,719	1,030
Net cash used by investing activities	(401,436)	(470,810)
Financing activities:
Issuance of debt	648,819	661,232
Repayments of debt	(455,886)	(491,043)
Debt issuance costs paid	(10,276)	(109)
Gas Purchase Commitment repayments		(25,900)
Issuance of KGS common units - net of offering costs		11,054
Distributions paid on KGS common units		(13,550)
Proceeds from exercise of stock options	733	1,388
Taxes paid on vesting of KGS equity compensation		(1,144)
Purchase of treasury stock	(4,841)	(4,851)
Net cash provided by financing activities	178,549	137,077
Effect of exchange rate changes in cash	(114)	(306)
Net increase (decrease) in cash	(48,335)	13,351
Cash at beginning of period	54,937	1,785
Cash at end of period	$ 6,602	$ 15,136