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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 745,208 $ 831,251
Accounts receivable (less accumulated provision for doubtful accounts March 31, 2012 and December 31, 2011: $16,769 and $16,371) 131,263 153,321
Unbilled revenues 15,869 30,257
Inventory 65,657 123,960
Derivative instruments, at fair value 608,647 512,161
Prepaid expenses and other 37,986 39,184
Total current assets 1,604,630 1,690,134
Equity in nonconsolidated investments 136,183 136,972
Property, plant and equipment 9,036,608 8,768,713
Less: accumulated depreciation and depletion 2,061,351 1,962,404
Net property, plant and equipment 6,975,257 6,806,309
Regulatory assets 100,035 94,095
Other assets 42,884 45,209
Total assets 8,858,989 8,772,719
Current liabilities:    
Current portion of long-term debt 229,944 219,315
Accounts payable 200,788 256,757
Derivative instruments, at fair value 120,044 123,306
Other current liabilities 165,156 205,532
Total current liabilities 715,932 804,910
Long-term debt 2,507,103 2,527,627
Deferred income taxes and investment tax credits 1,703,511 1,618,944
Unrecognized tax benefits 8,750 13,611
Pension and other post-retirement benefits 45,430 47,589
Other credits 172,129 166,208
Total liabilities 5,152,855 5,178,889
Common stockholders' equity:    
Common stock, no par value, authorized 320,000 shares; shares issued March 31, 2012 and December 31, 2011: 175,684 and 175,684 1,743,513 1,734,994
Treasury stock, shares at cost: March 31, 2012 and December 31, 2011: 26,109 and 26,207 (471,414) (473,215)
Retained earnings 2,183,007 2,143,910
Accumulated other comprehensive income 251,028 188,141
Total common stockholders' equity 3,706,134 3,593,830
Total liabilities and stockholders' equity $ 8,858,989 $ 8,772,719