Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income (loss)	$ (309,445)us-gaap_ProfitLoss	$ 56,139us-gaap_ProfitLoss
Loss from discontinued operations, net of tax	0	(45)
Income (loss) from continuing operations	(309,445)	56,184
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	95,507	99,557
Deferred income taxes	(160,633)us-gaap_DeferredIncomeTaxExpenseBenefit	35,965us-gaap_DeferredIncomeTaxExpenseBenefit
Unrealized loss on commodity derivatives	11,208	6,712
Write-down of oil and natural gas properties	500,400us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
Changes in current assets and liabilities, net of acquisitions:
Receivables	101,371us-gaap_IncreaseDecreaseInReceivables	25,611us-gaap_IncreaseDecreaseInReceivables
Inventories	(44,408)us-gaap_IncreaseDecreaseInInventories	(19,809)us-gaap_IncreaseDecreaseInInventories
Other current assets	(20,349)	(22,324)
Accounts payable	(53,334)	(11,525)
Other current liabilities	(16,119)	(28,355)
Other noncurrent changes	(9,537)	(4,987)
Net cash provided by continuing operations	94,661	137,029
Net cash provided by discontinued operations	0	8
Net cash provided by operating activities	94,661	137,037
Investing activities:
Capital expenditures	(189,463)	(179,646)
Acquisitions, net of cash acquired	0mdu_AcquisitionsNetOfCashAcquired	(206,304)mdu_AcquisitionsNetOfCashAcquired
Net proceeds from sale or disposition of property and other	26,801	5,179
Investments	2,449	458
Net cash used in continuing operations	(160,213)	(380,313)
Net cash provided by discontinued operations	0	0
Net cash used in investing activities	(160,213)	(380,313)
Financing activities:
Issuance of short-term borrowings	16,100us-gaap_ProceedsFromShortTermDebt	0us-gaap_ProceedsFromShortTermDebt
Repayment of short-term borrowings	0us-gaap_RepaymentsOfShortTermDebt	(11,500)us-gaap_RepaymentsOfShortTermDebt
Issuance of long-term debt	149,332	309,501
Repayment of long-term debt	(54,162)us-gaap_RepaymentsOfLongTermDebt	(58,232)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of common stock	9,864	54,843
Dividends paid	(35,607)us-gaap_PaymentsOfDividends	(33,737)us-gaap_PaymentsOfDividends
Excess tax benefit on stock-based compensation	0	4,833
Contribution from noncontrolling interest	20,500	16,000
Net cash provided by continuing operations	106,027	281,708
Net cash provided by discontinued operations	0	0
Net cash provided by financing activities	106,027	281,708
Effect of exchange rate changes on cash and cash equivalents	(89)	43
Increase in cash and cash equivalents	40,386	38,475
Cash and cash equivalents - beginning of year	81,855	45,225
Cash and cash equivalents - end of period	$ 122,241	$ 83,700

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