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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

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