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Condensed Consolidated Balance Sheets (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 79,225  
Accounts receivable (less accumulated provision for doubtful accounts June 30, 2011 and December 31, 2010: $18,180 and $18,335) 131,567 156,709
Unbilled revenues 7,061 38,361
Inventory 110,382 137,853
Derivative instruments, at fair value 211,986 225,339
Assets held for sale 201,852 207,678
Prepaid expenses and other 57,312 62,000
Total current assets 799,385 827,940
Equity in nonconsolidated investments 139,234 191,265
Property, plant and equipment 8,071,330 7,689,025
Less: accumulated depreciation and depletion 1,849,063 1,778,934
Net property, plant and equipment 6,222,267 5,910,091
Investments, available-for-sale   28,968
Regulatory assets 98,962 100,949
Other assets 33,241 39,225
Total assets 7,293,089 7,098,438
Current liabilities:    
Current portion of long-term debt 24,988 6,000
Short-term loans   53,650
Accounts payable 187,419 212,134
Derivative instruments, at fair value 97,531 106,721
Other current liabilities 162,097 218,479
Total current liabilities 472,035 596,984
Long-term debt 1,988,380 1,943,200
Deferred income taxes and investment tax credits 1,387,673 1,274,888
Unrecognized tax benefits 36,748 41,451
Pension and other post-retirement benefits 40,271 44,135
Other credits 131,427 119,084
Total liabilities 4,056,534 4,019,742
Common stockholders' equity:    
Common stock, no par value, authorized 320,000 shares; (shares issued June 30, 2011 and December 31, 2010: 175,685 and 175,684) 1,725,398 1,723,898
Treasury stock, at cost: (shares at June 30, 2011 and December 31, 2010: 26,226 and 26,531) (473,543) (479,072)
Retained earnings 1,939,980 1,795,766
Accumulated other comprehensive income 44,720 38,104
Total common stockholders' equity 3,236,555 3,078,696
Total liabilities and stockholders' equity $ 7,293,089 $ 7,098,438