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

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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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Present value of lessee's discounted obligation for lease payments from operating lease.

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Organization and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	Jun. 30, 2019 USD ($) coiled_tubing_units well_service_rigs drilling_rigs wireline_tubing_units	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Impact of adoption, operating lease assets \| $	$ 8,775		$ 0
Impact of adoption, operating lease liability \| $	8,817
Cash and Cash Equivalents
Cash Equivalents, at Carrying Value \| $	$ 11,800		$ 40,600
Accounting Standards Update 2016-02
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Impact of adoption, operating lease assets \| $		$ 9,800
Impact of adoption, operating lease liability \| $		9,800
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets \| $		$ 300
Drilling Services [Member]
Business - Drilling
Drilling Rigs	25
Drilling Services [Member] \| Pad-Capable [Member]
Business - Drilling
Percentage of Drilling Fleet	100.00%
Well Servicing [Member] \| 550 Horsepower [Member]
Business - Production Services
Well Servicing Rigs \| well_service_rigs	113
Well Servicing [Member] \| 600 Horsepower [Member]
Business - Production Services
Well Servicing Rigs \| well_service_rigs	12
Well Servicing [Member] \| Production Services [Member]
Business - Production Services
Well Servicing Rigs \| well_service_rigs	125
Wireline Services [Member] \| Production Services [Member]
Business - Production Services
Wireline Units \| wireline_tubing_units	95
Coiled Tubing Services [Member] \| Production Services [Member]
Business - Production Services
Coiled Tubing Units \| coiled_tubing_units	9
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member]
Business - Drilling
Drilling Divisions	3
Drilling Rigs	17
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| AC [Member]
Business - Drilling
Drilling Rigs	17
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| SCR Drilling Rigs [Member]
Business - Drilling
Drilling Rigs	0
International Drilling [Member] \| Drilling Services [Member] \| Colombia [Member]
Business - Drilling
Drilling Rigs	8
International Drilling [Member] \| Drilling Services [Member] \| Colombia [Member] \| AC [Member]
Business - Drilling
Drilling Rigs	0
International Drilling [Member] \| Drilling Services [Member] \| Colombia [Member] \| SCR Drilling Rigs [Member]
Business - Drilling
Drilling Rigs	8