Organization and Summary of Significant Accounting Policies (Revenues and Costs) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) drilling_rigs	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Deferred revenues \| $	$ 905	$ 1,449
Drilling Services [Member]
Recognition of Deferred Revenue \| $	2,400	1,566	$ 1,099
Capitalized Contract Cost, Amortization \| $	$ 4,953	2,813	$ 2,337
Drilling Rigs	24
Drilling Services [Member] \| Colombia [Member] \| International Drilling [Member]
Drilling Rigs	8
Drilling Services [Member] \| Colombia [Member] \| Earning Under Contract [Member] \| Currently Under Drilling Contract [Member] \| International Drilling [Member]
Drilling Rigs	6
Drilling Services [Member] \| Colombia [Member] \| Earning Under Contract [Member] \| Term Contract, Cancelable [Member] \| Currently Under Drilling Contract [Member] \| International Drilling [Member]
Drilling Rigs	5
Drilling Services [Member] \| Colombia [Member] \| SCR Drilling Rigs [Member] \| International Drilling [Member]
Drilling Rigs	8
Drilling Services [Member] \| United States [Member] \| Domestic Drilling [Member]
Drilling Rigs	16
Drilling Services [Member] \| United States [Member] \| SCR Drilling Rigs [Member] \| Domestic Drilling [Member]
Drilling Rigs	0
Drilling Services [Member] \| Geographic Distribution, Domestic [Member] \| Earning Under Contract [Member] \| Currently Under Drilling Contract [Member] \| Domestic Drilling [Member]
Drilling Rigs	16
Drilling Services [Member] \| Geographic Distribution, Domestic [Member] \| Earning Under Contract [Member] \| Term Contract [Member] \| Currently Under Drilling Contract [Member] \| Domestic Drilling [Member]
Drilling Rigs	14
Drilling Services [Member] \| Rig Mobilization [Member]
Deferred revenues \| $	$ 905	1,449
Deferred Costs, Current \| $	1,377	2,290
Deferred Revenue, Noncurrent \| $	558	202
Deferred Costs, Noncurrent \| $	$ 402	$ 212

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

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Sum of the carrying amounts as of the balance sheet date of deferred costs capitalized at the end of the reporting period that are expected to be charged against earnings within one year or the normal operating cycle, if longer.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.

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