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Schedule I-Condensed Financial Information of Registrant | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Schedule I-Condensed Financial Information of Registrant | Condensed Financial Information of Registrant (Unconsolidated) Condensed Statements of Income and Comprehensive Income
Years ended December 31, | 2017 |  | 2016 |  | 2015 |
| (In thousands)
Operating revenues | $ | 623,693 |  | $ | 561,266 |  | $ | 556,112 |
Operating expenses | 516,524 |  | 469,062 |  | 478,198 |
Operating income | 107,169 |  | 92,204 |  | 77,914 |
Other income | 1,331 |  | 1,491 |  | 8,318 |
Interest expense | 31,997 |  | 31,519 |  | 23,562 |
Income before income taxes | 76,503 |  | 62,176 |  | 62,670 |
Income taxes | 13,800 |  | 6,355 |  | 15,882 |
Equity in earnings of subsidiaries from continuing operations | 222,283 |  | 177,275 |  | 129,601 |
Net income from continuing operations | 284,986 |  | 233,096 |  | 176,389 |
Equity in loss of subsidiaries from discontinued operations attributable to the Company | (3,783 | ) | (168,663 | ) | (798,824 | )
Loss on redemption of preferred stocks | 600 |  | — |  | — |
Dividends declared on preferred stocks | 171 |  | 685 |  | 685 |
Earnings (loss) on common stock | $ | 280,432 |  | $ | 63,748 |  | $ | (623,120 | )
Comprehensive income (loss) | $ | 279,602 |  | $ | 65,848 |  | $ | (617,480 | )
The accompanying notes are an integral part of these condensed financial statements.Condensed Financial Information of Registrant (Unconsolidated) Condensed Balance Sheets
December 31, | 2017 |  | 2016 |
(In thousands, except shares and per share amounts) |
Assets |  |
Current assets: |  |
Cash and cash equivalents | $ | 843 |  | $ | 4,159 |
Receivables, net | 83,453 |  | 80,467 |
Accounts receivable from subsidiaries | 34,029 |  | 34,424 |
Inventories | 13,864 |  | 17,352 |
Prepayments and other current assets | 34,400 |  | 24,531 |
Total current assets | 166,589 |  | 160,933 |
Investments | 76,779 |  | 70,370 |
Investment in subsidiaries | 1,704,908 |  | 1,603,874 |
Property, plant and equipment | 2,631,161 |  | 2,502,264 |
Less accumulated depreciation, depletion and amortization | 797,130 |  | 756,191 |
Net property, plant and equipment | 1,834,031 |  | 1,746,073 |
Deferred charges and other assets: |  |
Goodwill | 4,812 |  | 4,812 |
Other | 175,599 |  | 183,654 |
Total deferred charges and other assets | 180,411 |  | 188,466 |
Total assets | $ | 3,962,718 |  | $ | 3,769,716 |
Liabilities and Stockholders' Equity |  |
Current liabilities: |  |
Long-term debt due within one year | $ | 100,011 |  | $ | 110 |
Accounts payable | 47,000 |  | 37,697 |
Accounts payable to subsidiaries | 7,234 |  | 5,592 |
Taxes payable | 13,717 |  | 14,992 |
Dividends payable | 38,573 |  | 37,767 |
Accrued compensation | 20,017 |  | 16,086 |
Other accrued liabilities | 36,881 |  | 34,929 |
Total current liabilities | 263,433 |  | 147,173 |
Long-term debt | 612,493 |  | 679,667 |
Deferred credits and other liabilities: |  |
Deferred income taxes | 147,847 |  | 270,126 |
Other | 509,902 |  | 356,506 |
Total deferred credits and other liabilities | 657,749 |  | 626,632 |
Commitments and contingencies |  |  |  |
Stockholders' equity: |  |  |  |
Preferred stocks | — |  | 15,000 |
Common stockholders' equity: |  |  |  |
Common stock |  |  |  |
Authorized - 500,000,000 shares, $1.00 par value |  |  |
Issued - 195,843,297 shares in 2017 and 2016 | 195,843 |  | 195,843 |
Other paid-in capital | 1,233,412 |  | 1,232,478 |
Retained earnings | 1,040,748 |  | 912,282 |
Accumulated other comprehensive loss | (37,334 | ) | (35,733 | )
Treasury stock at cost - 538,921 shares | (3,626 | ) | (3,626 | )
Total common stockholders' equity | 2,429,043 |  | 2,301,244 |
Total stockholders' equity | 2,429,043 |  | 2,316,244 |
Total liabilities and stockholders' equity | $ | 3,962,718 |  | $ | 3,769,716 |
The accompanying notes are an integral part of these condensed financial statements.Condensed Financial Information of Registrant (Unconsolidated) Condensed Statements of Cash Flows
Years ended December 31, | 2017 |  | 2016 |  | 2015 |
| (In thousands)
Net cash provided by operating activities | $ | 284,075 |  | $ | 238,125 |  | $ | 255,273 |
Investing activities: |  |  |  |  |
Capital expenditures | (146,370 | ) | (159,570 | ) | (349,985 | )
Net proceeds from sale or disposition of property and other | (5,665 | ) | 3,784 |  | 3,268 |
Investments in and advances to subsidiaries | (40,000 | ) | (5,000 | ) | (7,000 | )
Advances from subsidiaries | 40,000 |  | 15,000 |  | 100,000 |
Investments | (468 | ) | (129 | ) | 5 |
Net cash used in investing activities | (152,503 | ) | (145,915 | ) | (253,712 | )
Financing activities: |  |  |  |  |
Issuance of long-term debt | 70,080 |  | 106,420 |  | 224,185 |
Repayment of long-term debt | (37,569 | ) | (50,010 | ) | (108,008 | )
Proceeds from issuance of common stock | — |  | — |  | 21,898 |
Dividends paid | (150,727 | ) | (147,156 | ) | (142,835 | )
Redemption of preferred stock | (15,600 | ) | — |  | — |
Repurchase of common stock | (564 | ) | — |  | — |
Tax withholding on stock-based compensation | (508 | ) | (226 | ) | — |
Net cash used in financing activities | (134,888 | ) | (90,972 | ) | (4,760 | )
Increase (decrease) in cash and cash equivalents | (3,316 | ) | 1,238 |  | (3,199 | )
Cash and cash equivalents - beginning of year | 4,159 |  | 2,921 |  | 6,120 |
Cash and cash equivalents - end of year | $ | 843 |  | $ | 4,159 |  | $ | 2,921 |
The accompanying notes are an integral part of these condensed financial statements.Summary of Significant Accounting Policies Basis of presentation The condensed financial information reported in Schedule I is being presented to comply with Rule 12-04 of Regulation S-X. The information is unconsolidated and is presented for the parent company only, which is comprised of MDU Resources Group, Inc. (the Company) and Montana-Dakota and Great Plains, public utility divisions of the Company. In Schedule I, investments in subsidiaries are presented under the equity method of accounting where the assets and liabilities of the subsidiaries are not consolidated. The investments in net assets of the subsidiaries are recorded on the Condensed Balance Sheets. The income from subsidiaries is reported as equity in earnings of subsidiaries on the Condensed Statements of Income. The consolidated financial statements of MDU Resources Group, Inc. reflect certain businesses as discontinued operations. These statements should be read in conjunction with the consolidated financial statements and notes thereto of MDU Resources Group, Inc. Earnings (loss) per common share Please refer to the Consolidated Statements of Income of the registrant for earnings (loss) per common share. In addition, see Item 8 - Note 1 for information on the computation of earnings (loss) per common share. Note 2 - Debt At December 31, 2017, the Company had long-term debt maturities, excluding unamortized debt issuance costs, of $100.0 million in 2018, $74.5 million in 2019, $700,000 in 2020, $700,000 in 2021, $700,000 in 2022 and $538.1 million scheduled to mature in years after 2022. For more information on debt, see Item 8 - Note 6. Note 3 - Dividends The Company depends on earnings from its divisions and dividends from its subsidiaries to pay dividends on common stock. Cash dividends paid to the Company by subsidiaries were $116.1 million, $115.8 million and $110.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05(c)(Schedule II)) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96868048&loc=d3e5283-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(c)(Schedule I)) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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