Organization and Summary of Significant Accounting Policies (Production Services Business) (Details) - Production Services [Member]	Dec. 31, 2017 coiled_tubing_units well_service_rigs wireline_tubing_units
Wireline Services [Member]
Accounting Policies [Line Items]
Wireline Units | wireline_tubing_units	112
Wireline Services [Member] | Offshore Units [Domain]
Accounting Policies [Line Items]
Wireline Units | wireline_tubing_units	4
Wireline Services [Member] | Onshore [Member]
Accounting Policies [Line Items]
Wireline Units | wireline_tubing_units	108
Well Servicing [Member]
Accounting Policies [Line Items]
Well Servicing Rigs | well_service_rigs	125
Well Servicing [Member] | 550 Horsepower [Member]
Accounting Policies [Line Items]
Well Servicing Rigs | well_service_rigs	113
Well Servicing [Member] | 600 Horsepower [Member]
Accounting Policies [Line Items]
Well Servicing Rigs | well_service_rigs	12
Coiled Tubing Services [Member]
Accounting Policies [Line Items]
Coiled Tubing Units | coiled_tubing_units	14
Coiled Tubing Services [Member] | Offshore Units [Domain]
Accounting Policies [Line Items]
Coiled Tubing Units | coiled_tubing_units	4
Coiled Tubing Services [Member] | Onshore [Member]
Accounting Policies [Line Items]
Coiled Tubing Units | coiled_tubing_units	10