Divestiture [Line Items]

No definition available.

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- Definition

Number of rigs sold

+ References

No definition available.

+ Details

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- Definition

Number of rigs held for sale

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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- Definition

Describes an entity's accounting treatment for disposals of property, plant and equipment, including gains and losses related thereto.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51655414&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125663-122742

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Divestitures - Narrative (Details)	1 Months Ended	3 Months Ended		12 Months Ended
Divestitures - Narrative (Details)	Aug. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) rig	Mar. 31, 2015 USD ($) rig	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) rig	Dec. 31, 2013 USD ($) rig
Oil and Natural Gas
Divestiture [Line Items]
Proceeds from divestiture of assets				$ 1,900,000	$ 33,100,000	$ 21,700,000
Oil and Natural Gas \| Bakken Properties
Divestiture [Line Items]
Proceeds from divestiture of assets	$ 57,100,000
Drilling Equipment
Divestiture [Line Items]
Net book value of drilling rigs sold		11.0	0.3		16.3
Number of rigs sold \| rig		30	1		4	5
Gain (loss) on sale of drilling rigs		$ (7,300,000)	$ 7,900		$ 9,600,000	$ 16,500,000
Number of rigs held for sale \| rig						4