Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 375,355	$ 391,085
Accounts receivable - Trade, net of allowance for uncollectible accounts of $4,130 and $4,527, respectively	221,162	177,293
Unbilled revenue	13,878	33,712
Costs in excess of billing	14,996	15,699
Other current assets	123,236	123,065
Total current assets	748,627	740,854
Property and equipment	4,434,796	4,486,077
Less - accumulated depreciation	(1,961,043)	(1,958,997)
Property and equipment, net	2,473,753	2,527,080
Other assets:
Equity investments	186,423	187,031
Goodwill	62,344	62,494
Other assets, net	80,862	74,561
Total assets	3,552,009	3,592,020
Current liabilities:
Accounts payable	145,112	159,381
Accrued liabilities	159,676	198,237
Income taxes payable	3,856
Current maturities of long-term debt	7,877	10,179
Total current liabilities	316,521	367,797
Long-term debt	1,163,914	1,347,753
Deferred income taxes	441,520	413,639
Asset retirement obligations	169,429	170,410
Other long-term liabilities	4,844	5,777
Total liabilities	2,096,228	2,305,376
Convertible preferred stock	1,000	1,000
Commitments and contingencies
Shareholders' equity:
Common stock, no par, 240,000 shares authorized, 105,965 and 105,592 shares issued, respectively	913,976	906,957
Retained earnings	505,892	392,705
Accumulated other comprehensive income (loss)	7,520	(39,058)
Total controlling interest shareholders' equity	1,427,388	1,260,604
Noncontrolling interests	27,393	25,040
Total equity	1,454,781	1,285,644
Total liabilities and shareholders' equity	$ 3,552,009	$ 3,592,020