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Schedule I - Condensed Financial Information of Parent Company (Tables) | 12 Months Ended
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Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Income Statement [Table Text Block] |
| Year ended December 31,
| 2013 |  | 2012 |  | 2011
| (In thousands)
Operating Revenues | $ | — |  |  | $ | — |  |  | $ | — |
Operating Expenses | 941 |  |  | 3,287 |  |  | 20,547 |
Operating income (loss) | (941 | ) |  | (3,287 | ) |  | (20,547 | )
Other Income and Deductions: |  |  |  |  |
Equity in earnings of subsidiaries | 116,634 |  |  | 117,900 |  |  | 205,215 |
Other income | 769 |  |  | 670 |  |  | 59 |
Other deductions | (22,825 | ) |  | (20,904 | ) |  | (34,124 | )
Net other income (deductions) | 94,578 |  |  | 97,666 |  |  | 171,150 |
Earnings Before Income Taxes | 93,637 |  |  | 94,379 |  |  | 150,603 |
Income Tax Expense (Benefit) | (6,870 | ) |  | (11,168 | ) |  | (25,756 | )
Net Earnings | $ | 100,507 |  |  | $ | 105,547 |  |  | $ | 176,359 |
Condensed Cash Flow Statement [Table Text Block] |
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
| (In thousands)
Cash Flows From Operating Activities: |  |  |  |  |
Net earnings | $ | 100,507 |  |  | $ | 105,547 |  |  | $ | 176,359 |
Adjustments to reconcile net earnings to net cash flows from operating activities: |  |  |  |  |
Depreciation and amortization | 4,192 |  |  | 5,000 |  |  | 7,654 |
Deferred income tax expense | (51,820 | ) |  | (46,632 | ) |  | (34,396 | )
Equity in (earnings) of subsidiaries | (116,634 | ) |  | (117,900 | ) |  | (205,215 | )
Loss on reacquired debt | 3,253 |  |  | — |  |  | 9,209 |
Stock based compensation expense | 5,320 |  |  | 3,585 |  |  | 6,556 |
Changes in certain assets and liabilities: |  |  |  |  |
Other current assets | 28,460 |  |  | (43,638 | ) |  | 42,687 |
Other assets | 46,558 |  |  | 34,096 |  |  | 59,975 |
Accounts payable | 620 |  |  | 8 |  |  | (1 | )
Accrued interest and taxes | (9,266 | ) |  | (28,855 | ) |  | 27,348 |
Other current liabilities | (146 | ) |  | 3,876 |  |  | 4,765 |
Other liabilities | (27,756 | ) |  | (29,601 | ) |  | (12,854 | )
Net cash flows from operating activities | (16,712 | ) |  | (114,514 | ) |  | 82,087 |
Cash Flows From Investing Activities: |  |  |  |  |
Utility plant additions | (960 | ) |  | (7,524 | ) |  | — |
Investments in subsidiaries | (13,800 | ) |  | — |  |  | (43,000 | )
Cash dividends from subsidiaries | 158,772 |  |  | 61,406 |  |  | 285,757 |
Net cash flows from investing activities | 144,012 |  |  | 53,882 |  |  | 242,757 |
Cash Flows From Financing Activities: |  |  |  |  |
Short-term borrowings (repayments), net | (37,600 | ) |  | 120,900 |  |  | (15,300 | )
Short-term borrowings (repayments) – affiliate, net | — |  |  | — |  |  | 300 |
Repayment of long-term debt | (29,468 | ) |  | (2,387 | ) |  | (60,391 | )
Purchase of preferred stock | — |  |  | — |  |  | (73,475 | )
Purchase of common stock | — |  |  | — |  |  | (125,683 | )
Proceeds from stock option exercise | 4,618 |  |  | 11,684 |  |  | 5,622 |
Purchases to satisfy awards of common stock | (13,807 | ) |  | (25,168 | ) |  | (10,104 | )
Dividends paid | (50,980 | ) |  | (44,609 | ) |  | (45,128 | )
Other, net | — |  |  | — |  |  | (747 | )
Net cash flows from financing activities | (127,237 | ) |  | 60,420 |  |  | (324,906 | )
Change in Cash and Cash Equivalents | 63 |  |  | (212 | ) |  | (62 | )
Cash and Cash Equivalents at Beginning of Period | 29 |  |  | 241 |  |  | 303 |
Cash and Cash Equivalents at End of Period | $ | 92 |  |  | $ | 29 |  |  | $ | 241 |
Supplemental Cash Flow Disclosures: |  |  |  |  |
Interest paid | $ | 14,510 |  |  | $ | 15,007 |  |  | $ | 19,215 |
Income taxes paid (refunded), net | $ | 22,378 |  |  | $ | 1,501 |  |  | $ | 5,454 |
Condensed Balance Sheet [Table Text Block] |
| December 31,
| 2013 |  | 2012
| (In thousands)
Assets |  |  |
Cash and cash equivalents | $ | 92 |  |  | $ | 29 |
Intercompany receivables | 136,387 |  |  | 108,875 |
Income taxes receivable | 14,989 |  |  | 41,434 |
Other, net | 8,544 |  |  | 2,204 |
Total current assets | 160,012 |  |  | 152,542 |
Property, plant and equipment, net of accumulated depreciation of $9,167 and $8,262 | 26,601 |  |  | 25,642 |
Long-term investments | — |  |  | 3,651 |
Investment in subsidiaries | 1,683,321 |  |  | 1,688,168 |
Other long-term assets | 53,892 |  |  | 49,302 |
Total long-term assets | 1,763,814 |  |  | 1,766,763 |
| $ | 1,923,826 |  |  | $ | 1,919,305 |
Liabilities and Stockholders’ Equity |  |  |
Short-term debt | $ | 100,000 |  |  | $ | 137,600 |
Short-term debt-affiliate | 8,819 |  |  | 8,819 |
Current maturities of long-term debt | — |  |  | 2,530 |
Accrued interest and taxes | 2,797 |  |  | 3,127 |
Other current liabilities | 16,876 |  |  | 13,218 |
Total current liabilities | 128,492 |  |  | 165,294 |
Long-term debt | 118,766 |  |  | 142,592 |
Other long-term liabilities | 2,999 |  |  | 3,232 |
Total liabilities | 250,257 |  |  | 311,118 |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,178,369 |  |  | 1,182,819 |
Accumulated other comprehensive income (loss), net of tax | (58,140 | ) |  | (81,630 | )
Retained earnings | 553,340 |  |  | 506,998 |
Total common stockholders’ equity | 1,673,569 |  |  | 1,608,187 |
| $ | 1,923,826 |  |  | $ | 1,919,305 |
See Notes 6, 7, and 16 for information regarding commitments, contingencies, and maturities of long-term debt.

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