Number of drilling rigs removed from service

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- Definition

Number of rigs sold

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Amount of assets held-for-sale that are not part of a disposal group.

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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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.

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Divestitures (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Divestitures (Narrative) (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) rig	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) rig
Segment Reporting Information [Line Items]
Contract drilling impairment					$ 147,900
Gain (loss) on Disposition of Assets	$ 422	$ 161	$ (1,193)	$ 322
Assets held for sale	19,500		19,500		$ 22,511
Oil and Natural Gas [Member]
Segment Reporting Information [Line Items]
Proceeds from non-core oil and natural gas asset sales, net of related expenses			2,100	22,400
Gain (loss) on Disposition of Assets	60	59	$ 138	129
Drilling [Member]
Segment Reporting Information [Line Items]
Number of drilling rigs removed from service \| rig					41
Number of rigs sold \| rig			3
Gain (loss) on Disposition of Assets	296	$ 57	$ (1,449)	$ 84
Assets Held for Sale Drilling Equipment [Member]
Segment Reporting Information [Line Items]
Net book value of assets held for sale that were sold	$ 3,000		3,000
Gain (loss) on Disposition of Assets			$ (200)