Organization and Summary of Significant Accounting Policies (Drilling Services Business) (Details) - Drilling Services [Member]	Dec. 31, 2018 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	3
Drilling Rigs	16
United States [Member] | AC [Member] | Domestic Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	16
United States [Member] | SCR Drilling Rigs [Member] | Domestic Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	0
Colombia [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
Colombia [Member] | SCR Drilling Rigs [Member] | International Drilling [Member]
Accounting Policies [Line Items]
Drilling Rigs	8