Organization and Summary of Significant Accounting Policies (Drilling Services Segment) (Details) - Drilling Services Segment [Member]	Dec. 31, 2015 drilling_rigs
Accounting Policies [Line Items]
Drilling Rigs	31
South Texas [Member]
Accounting Policies [Line Items]
Drilling Rigs	7
West Texas [Member]
Accounting Policies [Line Items]
Drilling Rigs	6
North Dakota [Member]
Accounting Policies [Line Items]
Drilling Rigs	6
Appalachia [Member]
Accounting Policies [Line Items]
Drilling Rigs	4
Colombia [Member]
Accounting Policies [Line Items]
Drilling Rigs	8