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Condensed Statements of Cash Flows (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 584,740 | $ 626,648 | $ 551,633
Capital expenditures | (872,920) | (497,000) | (449,282)
Net proceeds from sale or disposition of property and other | 40,110 | 40,107 | 76,386
Investments | 9,725 | (10,302) | 704
Net cash used in investing activities | (887,952) | (464,545) | (407,944)
Issuance of short-term borrowings | 20,100 | 0 | 20,000
Repayment of short-term borrowings | 0 | (20,000) | (10,300)
Issuance of long-term debt | 467,957 | 300 | 20,200
Repayment of long-term debt | (138,775) | (85,151) | (13,668)
Proceeds from issuance of common stock | 88 | 5,744 | 4,972
Dividends paid | (159,768) | (123,323) | (119,157)
Excess tax benefit on stock-based compensation | 26 | 1,239 | 1,186
Net cash used in financing activities | 189,628 | (221,191) | (96,767)
Increase (decrease) in cash and cash equivalents | (113,730) | (59,302) | 46,960
Cash and cash equivalents - beginning of year | 162,772 | 222,074 | 175,114
Cash and cash equivalents - end of year | 49,042 | 162,772 | 222,074
MDU Resources Group, Inc. [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 225,968 | 217,514 | 185,887
Capital expenditures | (150,337) | (74,580) | (114,045)
Net proceeds from sale or disposition of property and other | 1,120 | 720 | 625
Investments in and advances to subsidiaries | (1,387) | (5,701) | (1,636)
Investments from and advances from subsidiaries | 5,000 | 0 | 0
Investments | 12 | 0 | (742)
Net cash used in investing activities | (145,592) | (79,561) | (115,798)
Issuance of short-term borrowings | 0 | 0 | 20,000
Repayment of short-term borrowings | 0 | (20,000) | 0
Issuance of long-term debt | 76,000 | 0 | 0
Repayment of long-term debt | (21) | (107) | (107)
Proceeds from issuance of common stock | 88 | 5,744 | 4,972
Dividends paid | (159,768) | (123,323) | (119,157)
Excess tax benefit on stock-based compensation | 21 | 358 | 375
Net cash used in financing activities | (83,680) | (137,328) | (93,917)
Increase (decrease) in cash and cash equivalents | (3,304) | 625 | (23,828)
Cash and cash equivalents - beginning of year | 6,900 | 6,275 | 30,103
Cash and cash equivalents - end of year | $ 3,596 | $ 6,900 | $ 6,275

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