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Schedule I-Condensed Financial Information of Registrant (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,065,749,000 |  | $ 1,152,181,000 | $ 930,757,000 | $ 901,805,000 | $ 1,042,551,000 |  | $ 1,125,923,000 |  | $ 906,444,000 | $ 834,777,000 | $ 4,050,492,000 |  | $ 3,909,695,000 |  | $ 4,176,501,000 |  |
Operating expenses | 939,172,000 |  | 1,032,760,000 | 848,454,000 | 823,739,000 | 912,377,000 |  | 1,016,961,000 | [1] | 817,782,000 | 751,848,000 | 3,644,125,000 |  | 3,498,968,000 |  | 4,329,598,000 |  |
Operating income (loss) | 126,577,000 |  | 119,421,000 | 82,303,000 | 78,066,000 | 130,174,000 |  | 108,962,000 | [1] | 88,662,000 | 82,929,000 | 406,367,000 |  | 410,727,000 |  | (153,097,000) |  |
Other income |  |  |  |  |  |  |  |  |  |  |  | 6,520,000 |  | 8,018,000 |  | 9,331,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 81,354,000 |  | 83,011,000 |  | 84,099,000 |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  | 110,274,000 |  | 122,530,000 |  | (96,092,000) |  |
Net income (loss) | 61,008,000 | [2] | 63,974,000 | 45,067,000 | 42,977,000 | 88,939,000 | [3] | 61,010,000 | [1] | 48,938,000 | 41,772,000 | 213,026,000 |  | 240,659,000 |  | (123,274,000) |  |
Dividends on preferred stocks |  |  |  |  |  |  |  |  |  |  |  | 685,000 |  | 685,000 |  | 685,000 |  |
Earnings on common stock |  |  |  |  |  |  |  |  |  |  |  | 212,341,000 |  | 239,974,000 |  | (123,959,000) |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 162,772,000 |  |  |  |  | 222,074,000 |  |  |  |  |  | 162,772,000 |  | 222,074,000 |  | 175,114,000 |  |
Receivables, net | 646,251,000 |  |  |  |  | 583,743,000 |  |  |  |  |  | 646,251,000 |  | 583,743,000 |  |  |  |
Inventories | 274,205,000 |  |  |  |  | 252,897,000 |  |  |  |  |  | 274,205,000 |  | 252,897,000 |  |  |  |
Deferred income taxes | 40,407,000 |  |  |  |  | 32,890,000 |  |  |  |  |  | 40,407,000 |  | 32,890,000 |  |  |  |
Prepayments and other current assets | 43,316,000 |  |  |  |  | 60,441,000 |  |  |  |  |  | 43,316,000 |  | 60,441,000 |  |  |  |
Total current assets | 1,194,638,000 |  |  |  |  | 1,167,168,000 |  |  |  |  |  | 1,194,638,000 |  | 1,167,168,000 |  |  |  |
Investments | 109,424,000 |  |  |  |  | 103,661,000 |  |  |  |  |  | 109,424,000 |  | 103,661,000 |  |  |  |
Property, plant and equipment | 7,646,222,000 |  |  |  |  | 7,218,503,000 |  |  |  |  |  | 7,646,222,000 |  | 7,218,503,000 |  |  |  |
Less accumulated depreciation, depletion and amortization | 3,361,208,000 |  |  |  |  | 3,103,323,000 |  |  |  |  |  | 3,361,208,000 |  | 3,103,323,000 |  | 2,872,465,000 |  |
Net property, plant and equipment | 4,285,014,000 |  |  |  |  | 4,115,180,000 |  |  |  |  |  | 4,285,014,000 |  | 4,115,180,000 |  | 3,894,117,000 |  |
Deferred charges and other assets: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 634,931,000 | [4] |  |  |  | 634,633,000 | [4] |  |  |  |  | 634,931,000 | [4] | 634,633,000 | [4] | 629,463,000 | [4] |
Other | 311,275,000 |  |  |  |  | 257,636,000 |  |  |  |  |  | 311,275,000 |  | 257,636,000 |  |  |  |
Total deferred charges and other assets | 967,049,000 |  |  |  |  | 917,540,000 |  |  |  |  |  | 967,049,000 |  | 917,540,000 |  |  |  |
Total assets | 6,556,125,000 |  |  |  |  | 6,303,549,000 |  |  |  |  |  | 6,556,125,000 |  | 6,303,549,000 |  | 5,990,952,000 |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | 0 |  |  |  |  | 20,000,000 |  |  |  |  |  | 0 |  | 20,000,000 |  |  |  |
Long-term debt due within one year | 139,267,000 |  |  |  |  | 72,797,000 |  |  |  |  |  | 139,267,000 |  | 72,797,000 |  |  |  |
Accounts payable | 337,228,000 |  |  |  |  | 301,132,000 |  |  |  |  |  | 337,228,000 |  | 301,132,000 |  |  |  |
Taxes payable | 70,176,000 |  |  |  |  | 56,186,000 |  |  |  |  |  | 70,176,000 |  | 56,186,000 |  |  |  |
Dividends payable | 31,794,000 |  |  |  |  | 30,773,000 |  |  |  |  |  | 31,794,000 |  | 30,773,000 |  |  |  |
Accrued Compensation | 47,804,000 |  |  |  |  | 40,121,000 |  |  |  |  |  | 47,804,000 |  | 40,121,000 |  |  |  |
Other accrued liabilities | 259,320,000 |  |  |  |  | 222,639,000 |  |  |  |  |  | 259,320,000 |  | 222,639,000 |  |  |  |
Total current liabilities | 898,753,000 |  |  |  |  | 768,076,000 |  |  |  |  |  | 898,753,000 |  | 768,076,000 |  |  |  |
Long-term debt | 1,285,411,000 |  |  |  |  | 1,433,955,000 |  |  |  |  |  | 1,285,411,000 |  | 1,433,955,000 |  |  |  |
Deferred credits and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 769,166,000 |  |  |  |  | 672,269,000 |  |  |  |  |  | 769,166,000 |  | 672,269,000 |  |  |  |
Other liabilities | 827,228,000 |  |  |  |  | 736,447,000 |  |  |  |  |  | 827,228,000 |  | 736,447,000 |  |  |  |
Total deferred credits and other liabilities | 1,596,394,000 |  |  |  |  | 1,408,716,000 |  |  |  |  |  | 1,596,394,000 |  | 1,408,716,000 |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stocks | 15,000,000 |  |  |  |  | 15,000,000 |  |  |  |  |  | 15,000,000 |  | 15,000,000 |  |  |  |
Common stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares authorized - 500,000,000 - issued - $1.00 par value, 189,332,485 shares at December 31, 2011 and 188,901,379 shares at December 31, 2010 | 189,332,000 |  |  |  |  | 188,901,000 |  |  |  |  |  | 189,332,000 |  | 188,901,000 |  |  |  |
Other paid-in capital | 1,035,739,000 |  |  |  |  | 1,026,349,000 |  |  |  |  |  | 1,035,739,000 |  | 1,026,349,000 |  |  |  |
Retained earnings | 1,586,123,000 |  |  |  |  | 1,497,439,000 |  |  |  |  |  | 1,586,123,000 |  | 1,497,439,000 |  |  |  |
Accumulated other comprehensive loss | (47,001,000) |  |  |  |  | (31,261,000) |  |  |  |  |  | (47,001,000) |  | (31,261,000) |  | (20,833,000) |  |
Treasury stock at cost - 538,921 shares | (3,626,000) |  |  |  |  | (3,626,000) |  |  |  |  |  | (3,626,000) |  | (3,626,000) |  |  |  |
Total common stockholders' equity | 2,760,567,000 |  |  |  |  | 2,677,802,000 |  |  |  |  |  | 2,760,567,000 |  | 2,677,802,000 |  | 2,556,647,000 |  | 2,746,076,000
Total stockholders' equity | 2,775,567,000 |  |  |  |  | 2,692,802,000 |  |  |  |  |  | 2,775,567,000 |  | 2,692,802,000 |  |  |  |
Total liabilities and stockholders' equity | 6,556,125,000 |  |  |  |  | 6,303,549,000 |  |  |  |  |  | 6,556,125,000 |  | 6,303,549,000 |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | 626,648,000 |  | 551,633,000 |  | 846,686,000 |  |
Investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | (497,000,000) |  | (449,282,000) |  | (448,675,000) |  |
Net proceeds from sale or disposition of property and other |  |  |  |  |  |  |  |  |  |  |  | 40,107,000 |  | 76,386,000 |  | 26,679,000 |  |
Investments |  |  |  |  |  |  |  |  |  |  |  | (10,302,000) |  | 704,000 |  | (3,740,000) |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  |  | (464,545,000) |  | (407,944,000) |  | (432,146,000) |  |
Financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of short-term borrowings |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 20,000,000 |  | 10,300,000 |  |
Repayment of short-term borrowings |  |  |  |  |  |  |  |  |  |  |  | (20,000,000) |  | (10,300,000) |  | (105,100,000) |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  | 20,200,000 |  | 145,000,000 |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  |  | (85,151,000) |  | (13,668,000) |  | (292,907,000) |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | 5,744,000 |  | 4,972,000 |  | 65,207,000 |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  | (123,323,000) |  | (119,157,000) |  | (115,023,000) |  |
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 1,239,000 |  | 1,186,000 |  | 601,000 |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  | (221,191,000) |  | (96,767,000) |  | (291,922,000) |  |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | (59,302,000) |  | 46,960,000 |  | 123,400,000 |  |
Cash and cash equivalents - beginning of year |  |  |  |  | 222,074,000 |  |  |  |  |  | 175,114,000 | 222,074,000 |  | 175,114,000 |  | 51,714,000 |  |
Cash and cash equivalents - end of year | 162,772,000 |  |  |  |  | 222,074,000 |  |  |  |  |  | 162,772,000 |  | 222,074,000 |  | 175,114,000 |  |
MDU Resources Group, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  | 518,268,000 |  | 503,658,000 |  | 514,519,000 |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  | 450,579,000 |  | 431,293,000 |  | 458,130,000 |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 67,689,000 |  | 72,365,000 |  | 56,389,000 |  |
Other income |  |  |  |  |  |  |  |  |  |  |  | 2,710,000 |  | 5,734,000 |  | 6,588,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 18,660,000 |  | 16,664,000 |  | 13,996,000 |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  | 51,739,000 |  | 61,435,000 |  | 48,981,000 |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  | 10,476,000 |  | 17,983,000 |  | 13,279,000 |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 171,763,000 |  | 197,207,000 |  | (158,976,000) |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 213,026,000 |  | 240,659,000 |  | (123,274,000) |  |
Dividends on preferred stocks |  |  |  |  |  |  |  |  |  |  |  | 685,000 |  | 685,000 |  | 685,000 |  |
Earnings on common stock |  |  |  |  |  |  |  |  |  |  |  | 212,341,000 |  | 239,974,000 |  | (123,959,000) |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 6,900,000 |  |  |  |  | 6,275,000 |  |  |  |  |  | 6,900,000 |  | 6,275,000 |  | 30,103,000 |  |
Receivables, net | 67,761,000 |  |  |  |  | 76,757,000 |  |  |  |  |  | 67,761,000 |  | 76,757,000 |  |  |  |
Accounts receivable from subsidiaries | 28,734,000 |  |  |  |  | 27,837,000 |  |  |  |  |  | 28,734,000 |  | 27,837,000 |  |  |  |
Inventories | 42,596,000 |  |  |  |  | 34,583,000 |  |  |  |  |  | 42,596,000 |  | 34,583,000 |  |  |  |
Deferred income taxes | 2,000 |  |  |  |  | 0 |  |  |  |  |  | 2,000 |  | 0 |  |  |  |
Prepayments and other current assets | 12,154,000 |  |  |  |  | 15,473,000 |  |  |  |  |  | 12,154,000 |  | 15,473,000 |  |  |  |
Total current assets | 158,147,000 |  |  |  |  | 160,925,000 |  |  |  |  |  | 158,147,000 |  | 160,925,000 |  |  |  |
Investments | 47,835,000 |  |  |  |  | 48,038,000 |  |  |  |  |  | 47,835,000 |  | 48,038,000 |  |  |  |
Investment in subsidiaries | 2,402,891,000 |  |  |  |  | 2,336,133,000 |  |  |  |  |  | 2,402,891,000 |  | 2,336,133,000 |  |  |  |
Property, plant and equipment | 1,453,089,000 |  |  |  |  | 1,388,128,000 |  |  |  |  |  | 1,453,089,000 |  | 1,388,128,000 |  |  |  |
Less accumulated depreciation, depletion and amortization | 605,510,000 |  |  |  |  | 583,447,000 |  |  |  |  |  | 605,510,000 |  | 583,447,000 |  |  |  |
Net property, plant and equipment | 847,579,000 |  |  |  |  | 804,681,000 |  |  |  |  |  | 847,579,000 |  | 804,681,000 |  |  |  |
Deferred charges and other assets: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 4,812,000 |  |  |  |  | 4,812,000 |  |  |  |  |  | 4,812,000 |  | 4,812,000 |  |  |  |
Other | 166,732,000 |  |  |  |  | 119,081,000 |  |  |  |  |  | 166,732,000 |  | 119,081,000 |  |  |  |
Total deferred charges and other assets | 171,544,000 |  |  |  |  | 123,893,000 |  |  |  |  |  | 171,544,000 |  | 123,893,000 |  |  |  |
Total assets | 3,627,996,000 |  |  |  |  | 3,473,670,000 |  |  |  |  |  | 3,627,996,000 |  | 3,473,670,000 |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | 0 |  |  |  |  | 20,000,000 |  |  |  |  |  | 0 |  | 20,000,000 |  |  |  |
Long-term debt due within one year | 107,000 |  |  |  |  | 107,000 |  |  |  |  |  | 107,000 |  | 107,000 |  |  |  |
Accounts payable | 37,986,000 |  |  |  |  | 36,235,000 |  |  |  |  |  | 37,986,000 |  | 36,235,000 |  |  |  |
Accounts payable to subsidiaries | 4,868,000 |  |  |  |  | 9,445,000 |  |  |  |  |  | 4,868,000 |  | 9,445,000 |  |  |  |
Taxes payable | 18,304,000 |  |  |  |  | 8,104,000 |  |  |  |  |  | 18,304,000 |  | 8,104,000 |  |  |  |
Deferred income taxes | 0 |  |  |  |  | 469,000 |  |  |  |  |  | 0 |  | 469,000 |  |  |  |
Dividends payable | 31,794,000 |  |  |  |  | 30,773,000 |  |  |  |  |  | 31,794,000 |  | 30,773,000 |  |  |  |
Accrued Compensation | 10,173,000 |  |  |  |  | 11,540,000 |  |  |  |  |  | 10,173,000 |  | 11,540,000 |  |  |  |
Other accrued liabilities | 27,064,000 |  |  |  |  | 26,002,000 |  |  |  |  |  | 27,064,000 |  | 26,002,000 |  |  |  |
Total current liabilities | 130,296,000 |  |  |  |  | 142,675,000 |  |  |  |  |  | 130,296,000 |  | 142,675,000 |  |  |  |
Long-term debt | 280,781,000 |  |  |  |  | 280,889,000 |  |  |  |  |  | 280,781,000 |  | 280,889,000 |  |  |  |
Deferred credits and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 137,751,000 |  |  |  |  | 103,725,000 |  |  |  |  |  | 137,751,000 |  | 103,725,000 |  |  |  |
Other liabilities | 303,601,000 |  |  |  |  | 253,579,000 |  |  |  |  |  | 303,601,000 |  | 253,579,000 |  |  |  |
Total deferred credits and other liabilities | 441,352,000 |  |  |  |  | 357,304,000 |  |  |  |  |  | 441,352,000 |  | 357,304,000 |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stocks | 15,000,000 |  |  |  |  | 15,000,000 |  |  |  |  |  | 15,000,000 |  | 15,000,000 |  |  |  |
Common stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares authorized - 500,000,000 - issued - $1.00 par value, 189,332,485 shares at December 31, 2011 and 188,901,379 shares at December 31, 2010 | 189,332,000 |  |  |  |  | 188,901,000 |  |  |  |  |  | 189,332,000 |  | 188,901,000 |  |  |  |
Other paid-in capital | 1,035,739,000 |  |  |  |  | 1,026,349,000 |  |  |  |  |  | 1,035,739,000 |  | 1,026,349,000 |  |  |  |
Retained earnings | 1,586,123,000 |  |  |  |  | 1,497,439,000 |  |  |  |  |  | 1,586,123,000 |  | 1,497,439,000 |  |  |  |
Accumulated other comprehensive loss | (47,001,000) |  |  |  |  | (31,261,000) |  |  |  |  |  | (47,001,000) |  | (31,261,000) |  |  |  |
Treasury stock at cost - 538,921 shares | (3,626,000) |  |  |  |  | (3,626,000) |  |  |  |  |  | (3,626,000) |  | (3,626,000) |  |  |  |
Total common stockholders' equity | 2,760,567,000 |  |  |  |  | 2,677,802,000 |  |  |  |  |  | 2,760,567,000 |  | 2,677,802,000 |  |  |  |
Total stockholders' equity | 2,775,567,000 |  |  |  |  | 2,692,802,000 |  |  |  |  |  | 2,775,567,000 |  | 2,692,802,000 |  |  |  |
Total liabilities and stockholders' equity | 3,627,996,000 |  |  |  |  | 3,473,670,000 |  |  |  |  |  | 3,627,996,000 |  | 3,473,670,000 |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | 217,514,000 |  | 185,887,000 |  | 209,128,000 |  |
Investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | (74,580,000) |  | (114,045,000) |  | (120,352,000) |  |
Net proceeds from sale or disposition of property and other |  |  |  |  |  |  |  |  |  |  |  | 720,000 |  | 625,000 |  | 1,039,000 |  |
Investments in and advances to subsidiaries |  |  |  |  |  |  |  |  |  |  |  | (5,701,000) |  | (1,636,000) |  | 0 |  |
Investments From and Advances From Subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 2,916,000 |  |
Disposition of investments in subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 20,000,000 |  |
Investments |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (742,000) |  | (637,000) |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  |  | (79,561,000) |  | (115,798,000) |  | (97,034,000) |  |
Financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of short-term borrowings |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 20,000,000 |  | 0 |  |
Repayment of short-term borrowings |  |  |  |  |  |  |  |  |  |  |  | (20,000,000) |  | 0 |  | 0 |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 50,000,000 |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  |  | (107,000) |  | (107,000) |  | (85,104,000) |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | 5,744,000 |  | 4,972,000 |  | 65,207,000 |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  | (123,323,000) |  | (119,157,000) |  | (115,023,000) |  |
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 358,000 |  | 375,000 |  | 264,000 |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  | (137,328,000) |  | (93,917,000) |  | (84,656,000) |  |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | 625,000 |  | (23,828,000) |  | 27,438,000 |  |
Cash and cash equivalents - beginning of year |  |  |  |  | 6,275,000 |  |  |  |  |  | 30,103,000 | 6,275,000 |  | 30,103,000 |  | 2,665,000 |  |
Cash and cash equivalents - end of year | 6,900,000 |  |  |  |  | 6,275,000 |  |  |  |  |  | 6,900,000 |  | 6,275,000 |  | 30,103,000 |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 280,900,000 |  |  |  |  |  |  |  |  |  |  | 280,900,000 |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 100,000 |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
2012 | 100,000 |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
2013 | 100,000 |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
2014 | 100,000 |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
2015 | 100,000 |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
2016 | 50,000,000 |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |
Thereafter 2016 | 230,500,000 |  |  |  |  |  |  |  |  |  |  | 230,500,000 |  |  |  |  |  |
Cash Dividends Paid to Parent Company [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  |  | $ 96,100,000 |  | $ 96,400,000 |  | $ 116,300,000 |  |
[1] | 2010 reflects a natural gas gathering arbitration charge of $16.5 million (after tax). For more information, see Note 19.
[2] | 2011 reflects an arbitration charge of $13.0 million (after tax) related to a guarantee of a construction contract. For more information, see Note 19.
[3] | 2010 reflects a $13.8 million (after tax) gain on the sale of the Brazilian Transmission Lines. For more information, see Note 4.
[4] | Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.

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