Organization and Summary of Significant Accounting Policies (Drilling Services Business) (Details) - Drilling Services [Member]	Dec. 31, 2017 drilling_rigs
Accounting Policies [Line Items]
Drilling Rigs	24
Pad-Capable [Member]
Accounting Policies [Line Items]
Percentage of Drilling Fleet	100.00%
United States [Member] | Domestic Drilling [Member]
Accounting Policies [Line Items]
Drilling Divisions	4
Drilling Rigs	16
United States [Member] | SCR Drilling Rigs [Member] | Domestic Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	0
United States [Member] | AC [Member] | Domestic Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	16
Colombia [Member] | International Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	8
Colombia [Member] | SCR Drilling Rigs [Member] | International Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	8
Colombia [Member] | AC [Member] | International Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	0
Currently Under Drilling Contract [Member] | Earning Under Contract [Member] | Colombia [Member] | International Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	6
Currently Under Drilling Contract [Member] | Term Contract, Cancelable [Member] | Earning Under Contract [Member] | Colombia [Member] | International Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	5