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Acquisitions and divestitures (2018 Acquisitions and divestitures) (Details)	9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) a provider	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset dispositions		$ 50,523,000
(Loss) gain on sale of assets	$ (25,996,000)	(2,582,000)
Oil and gas leasehold exchanges	$ 816,000	10,913,000
Other Non-core Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset dispositions		22,637,000
Non-core Oil and Gas Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset dispositions			$ 9,200,000
(Loss) gain on sale of assets		0
Oklahoma/Texas Panhandle
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset dispositions		17,000,000
Conveyance in liabilities to buyer		$ 629,000
Kingfisher and Garfield Counties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Service contracts term		15 years
Kingfisher and Garfield Counties \| Saltwater Disposal Infrastructure
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset dispositions		$ 11,841,000
Kingfisher, Garfield and Canadian Counties, Oklahoma
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of service providers \| provider		2
Canadian County, Oklahoma
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Service contracts term		5 years
STACK
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisitions of leasehold acreage		$ 122,309,000
Capitalized interest		10,925,000
Oil and gas leasehold exchanges		$ 10,913,000
Area of real estate property (in acres) \| a		24,600