Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

The following table presents the estimated useful lives and costs of our assets by class:

		As of December 31,
		2018		2017
	Lives	Cost (amounts in thousands)
Drilling rigs and equipment	3 - 25	$	590,148	$	594,743
Well servicing rigs and equipment	3 - 20	252,589		244,747
Wireline units and equipment	1 - 10	144,171		142,224
Coiled tubing units and equipment	1 - 7	25,689		18,141
Vehicles	3 - 10	50,317		47,932
Office equipment	3 - 10	11,606		12,717
Buildings and improvements	3 - 40	23,610		24,013
Property and equipment not yet placed in service	—	17,718		6,751
Land	—	2,367		2,367
		$	1,118,215	$	1,093,635