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Organization and Summary of Significant Accounting Policies (Drilling Contracts) (Details) - Drilling Services Segment [Member] - drilling_rigs
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Line Items]    
Drilling Rigs 31  
Received Early Termination Notice on Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 19  
Received Early Termination Notice on Contract in 2016 [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 3  
Currently Under Drilling Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 14  
Currently Under Drilling Contract [Member] | Spot Market Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 2  
Currently Under Drilling Contract [Member] | Term Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 12  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months 4  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months to One Year 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Twelve Months to Eighteen Months 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Eighteen Months to Two Years 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Twenty Four Months to Fourty Eight Months 5  
Geographic Distribution, Domestic [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 23  
Geographic Distribution, Domestic [Member] | Currently Under Drilling Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 11  
Geographic Distribution, Domestic [Member] | Currently Under Drilling Contract [Member] | Term Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 9  
Geographic Distribution, Domestic [Member] | Currently Under Drilling Contract [Member] | Earning Under Contract [Member] | Spot Market Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 2  
Geographic Distribution, Domestic [Member] | Currently Under Drilling Contract [Member] | Earning Under Contract [Member] | Term Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 7  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months to One Year 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Twelve Months to Eighteen Months 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Eighteen Months to Two Years 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Twenty Four Months to Fourty Eight Months 3  
Geographic Distribution, Domestic [Member] | Currently Under Drilling Contract [Member] | Earning But Not Working [Member] | Spot Market Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 0  
Geographic Distribution, Domestic [Member] | Currently Under Drilling Contract [Member] | Earning But Not Working [Member] | Term Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 2  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months 2  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months to One Year 0  
Assigned Drilling Rigs, Number of Contracts Expiring in Twelve Months to Eighteen Months 0  
Assigned Drilling Rigs, Number of Contracts Expiring in Eighteen Months to Two Years 0  
Assigned Drilling Rigs, Number of Contracts Expiring in Twenty Four Months to Fourty Eight Months 0  
Geographic Distribution, Foreign [Member] | Currently Under Drilling Contract [Member] | Suspended Operations (not earning) [Member] | Spot Market Contract [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 0  
Geographic Distribution, Foreign [Member] | Currently Under Drilling Contract [Member] | Suspended Operations (not earning) [Member] | Term Contract, Cancelable [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 3  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months 1  
Assigned Drilling Rigs, Number of Contracts Expiring in Six Months to One Year 0  
Assigned Drilling Rigs, Number of Contracts Expiring in Twelve Months to Eighteen Months 0  
Assigned Drilling Rigs, Number of Contracts Expiring in Eighteen Months to Two Years 0  
Assigned Drilling Rigs, Number of Contracts Expiring in Twenty Four Months to Fourty Eight Months 2  
Colombia [Member]    
Accounting Policies [Line Items]    
Drilling Rigs 8 8
Minimum [Member]    
Accounting Policies [Line Items]    
Drilling Rigs, Contractual Terms six months  
Maximum [Member]    
Accounting Policies [Line Items]    
Drilling Rigs, Contractual Terms 4 years