Business [Abstract] for Organization and Summary of Significant Accounting Policies

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Organization and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands		12 Months Ended
	Jul. 31, 2018 drilling_rigs	Dec. 31, 2018 USD ($) drilling_rigs	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Cash and Cash Equivalents
Cash \| $		$ 13,000
Cash Equivalents, at Carrying Value \| $		40,600
Related Party Transactions
Related Party Transaction, Amounts of Transaction \| $		$ 200	$ 200	$ 200
Drilling Services [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs		24
Drilling Services [Member] \| Pad-Capable [Member]
Business - Drilling
Percentage of Drilling Fleet		100.00%
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member]
Business - Drilling
Drilling Divisions		3
Drilling Rigs \| drilling_rigs		16
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| AC [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs		16
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| SCR Drilling Rigs [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs		0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets \| $						$ 100
Scenario, Forecast [Member] \| Accounting Standards Update 2016-02, Forecast
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Expected impact of adoption, assets \| $					$ 10,000
Operating Lease, Liability, Current \| $					$ 10,000
Construction in Progress [Member] \| Domestic Drilling [Member] \| Drilling Services [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs		1
Currently Under Drilling Contract [Member] \| Construction in Progress [Member] \| Term Contract \| Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member]
Business - Drilling
Contract Period	3 years
Currently Under Drilling Contract [Member] \| Construction in Progress [Member] \| Term Contract \| Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| AC [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	1