Property and Equipment (Schedule of estimated useful lives and costs of asset classes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,119,546	$ 1,118,215
Drilling rigs and equipment | Drilling Services [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 613,061	590,148
Drilling rigs and equipment | Drilling Services [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Drilling rigs and equipment | Drilling Services [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Well servicing rigs and equipment | Production Services [Member] | Well Servicing [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 259,102	252,589
Well servicing rigs and equipment | Production Services [Member] | Well Servicing [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Well servicing rigs and equipment | Production Services [Member] | Well Servicing [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Wireline units and equipment | Production Services [Member] | Wireline Services [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 131,628	144,171
Wireline units and equipment | Production Services [Member] | Wireline Services [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Wireline units and equipment | Production Services [Member] | Wireline Services [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Coiled tubing units and equipment | Production Services [Member] | Coiled Tubing Services [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 30,816	25,689
Coiled tubing units and equipment | Production Services [Member] | Coiled Tubing Services [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Coiled tubing units and equipment | Production Services [Member] | Coiled Tubing Services [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Vehicles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 50,308	50,317
Vehicles | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Vehicles | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Office equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 12,353	11,606
Office equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Office equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 16,988	23,610
Building and improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Building and improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Property and equipment not yet placed in service
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 3,330	17,718
Property and equipment not yet placed in service | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	0 years
Property and equipment not yet placed in service | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	0 years
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,960	$ 2,367
Land | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	0 years
Land | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	0 years