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Consolidated Statements of Cash Flows (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities:      
Net income (loss) available for common stock $ 81,528,000 $ 49,730,000 $ 68,685,000
(Income) loss from discontinued operations, net of tax 6,977,000 (9,365,000) (5,544,000)
Income (loss) from continuing operations 88,505,000 40,365,000 63,141,000
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities:      
Depreciation, depletion and amortization 154,632,000 135,591,000 126,606,000
Deferred financing cost amortization 5,555,000 5,655,000 5,859,000
Impairment of long-lived assets 26,868,000 [1] 0 0
Derivative fair value adjustments 2,728,000 (8,693,000) 13,546,000
Gain on sale of operating assets (29,129,000) 0 (8,921,000)
Stock compensation 8,271,000 5,643,000 5,637,000
Unrealized mark-to-market loss (gain) on interest rate swaps (1,882,000) 42,010,000 15,193,000
Deferred income taxes 39,716,000 33,600,000 17,354,000
Equity in (earnings) loss of unconsolidated subsidiaries (10,000) (1,121,000) (1,559,000)
Allowance for funds used during construction - equity (540,000) (932,000) (2,996,000)
Employee benefit plans 20,973,000 14,586,000 16,342,000
Other adjustments, net 2,751,000 4,947,000 (9,710,000)
Changes in certain operating assets and liabilities:      
Materials, supplies and fuel 6,343,000 (21,385,000) (338,000)
Accounts receivable, unbilled revenues and other current assets (2,257,000) (4,202,000) (18,480,000)
Accounts payable and other current liabilities (10,713,000) (31,091,000) (12,848,000)
Regulatory assets 12,864,000 12,691,000 (21,283,000)
Regulatory liabilities 3,194,000 11,198,000 50,000
Contributions to defined benefit pension plans (25,350,000) (11,050,000) (30,015,000)
Other operating activities, net (6,732,000) (11,118,000) (1,013,000)
Net cash provided by (used in) operating activities of continuing operations 295,787,000 216,694,000 156,565,000
Net cash provided by (used in) operating activities of discontinued operations 21,184,000 7,010,000 (8,813,000)
Net cash provided by (used in) operating activities 316,971,000 223,704,000 147,752,000
Investing activities:      
Property, plant and equipment additions (349,129,000) (440,698,000) (472,292,000)
Payment for acquisition of assets, net of cash acquired 0 0 (2,250,000)
Proceeds from sale of assets 253,791,000 583,000 70,357,000
Other investing activities (180,000) (4,533,000) 15,407,000
Net cash provided by (used in) investing activities of continuing operations (95,518,000) (444,648,000) (388,778,000)
Proceeds from sale of business operations 107,511,000 0 0
Net cash provided by (used in) investing activities of discontinued operations (824,000) (2,359,000) (390,000)
Net cash provided by (used in) investing activities 11,169,000 (447,007,000) (389,168,000)
Financing activities:      
Dividends paid on common stock (65,262,000) (59,202,000) (56,467,000)
Common stock issued 4,726,000 123,041,000 3,246,000
Short-term borrowings - issuances 203,753,000 1,017,300,000 854,500,000
Short-term borrowings - repayments (271,753,000) (821,300,000) (770,000,000)
Long-term debt - issuance 0 0 200,000,000
Long-term debt - repayments (240,077,000) (8,382,000) (59,926,000)
Other financing activities (2,833,000) (1,666,000) (8,363,000)
Net cash provided by (used in) financing activities of continuing operations (371,446,000) 249,791,000 162,990,000
Net cash provided by (used in) financing activities of discontinued operations 0 (158,000) (2,037,000)
Net cash provided by (used in) financing activities (371,446,000) 249,633,000 160,953,000
Net change in cash and cash equivalents (43,306,000) 26,330,000 (80,463,000)
Cash and cash equivalents:      
Cash and cash equivalents, beginning of year 58,768,000 [2] 32,438,000 [2] 112,901,000 [2]
Cash and cash equivalents, end of year 15,462,000 58,768,000 [2] 32,438,000 [2]
Discontinued Operation, Additional Disclosures [Abstract]      
Cash and Cash Equivalents of Discontinued Operations   $ 37,100,000 $ 16,000,000
[1] Oil and Gas includes a ceiling test impairment (see Note 12).
[2] Cash and cash equivalents include cash of discontinued operations of $37.1 million, $16.0 million and $97.5 million at Dec. 31, 2011, 2010 and 2009, respectively.