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Organization and Summary of Significant Accounting Policies (Revenues and Costs) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
drilling_rigs
Mar. 31, 2016
USD ($)
May 01, 2017
drilling_rigs
Dec. 31, 2016
USD ($)
Recognition of Deferred Revenue | $ $ 800 $ 300    
Deferred revenues | $ 581     $ 1,449
Drilling Services Segment [Member]        
Deferred revenues | $ 581     1,449
Costs in Excess of Billings, Current | $ 984     2,290
Deferred Revenue, Noncurrent | $ 61     202
Costs in Excess of Billings, Noncurrent | $ $ 51     $ 212
Drilling Rigs 24      
Colombia [Member] | Drilling Services Segment [Member]        
Drilling Rigs 8      
Colombia [Member] | SCR Drilling Rigs [Member] | Drilling Services Segment [Member]        
Drilling Rigs 8      
Colombia [Member] | Subsequent Event [Member] | Currently Under Drilling Contract [Member] | Drilling Services Segment [Member]        
Drilling Rigs     3  
Colombia [Member] | Subsequent Event [Member] | Term Contract, Cancelable [Member] | Currently Under Drilling Contract [Member] | Drilling Services Segment [Member]        
Drilling Rigs     2  
United States [Member] | Drilling Services Segment [Member]        
Drilling Rigs 16      
Geographic Distribution, Domestic [Member] | Subsequent Event [Member] | Earning Under Contract [Member] | Currently Under Drilling Contract [Member] | Drilling Services Segment [Member]        
Drilling Rigs     15  
Geographic Distribution, Domestic [Member] | Subsequent Event [Member] | Earning Under Contract [Member] | Term Contract [Member] | Currently Under Drilling Contract [Member] | Drilling Services Segment [Member]        
Drilling Rigs     11