Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Components of Property, Plant and Equipment
Property and equipment	$ 151,499	$ 161,004
Less accumulated depreciation	(62,345)	(69,091)
Property and equipment, net	89,154	91,913
Land
Components of Property, Plant and Equipment
Property and equipment	7,746	7,145
Buildings and leasehold improvements
Components of Property, Plant and Equipment
Property and equipment	51,495	34,351
Machinery, equipment and rental tools
Components of Property, Plant and Equipment
Property and equipment	65,798	85,611
Equipment in progress
Components of Property, Plant and Equipment
Property and equipment	4,113	12,304
Furniture and fixtures
Components of Property, Plant and Equipment
Property and equipment	2,736	2,749
Transportation equipment
Components of Property, Plant and Equipment
Property and equipment	7,554	7,462
Computer equipment and software
Components of Property, Plant and Equipment
Property and equipment	$ 12,057	$ 11,382