Acquisitions (Identifiable Intangible Assets Acquired) (Details) - USD ($) $ in Thousands		Nov. 23, 2015	Mar. 13, 2015	Jan. 13, 2015
TEW Plus LTD [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		$ 1,074
TEW Plus LTD [Member] | Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		0
TEW Plus LTD [Member] | Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		817
TEW Plus LTD [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		203
TEW Plus LTD [Member] | Non-competition agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		$ 54
Inspection Oilfield Services (IOS) [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets	[1],[2]		$ 50,354
Inspection Oilfield Services (IOS) [Member] | Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets			2,641
Inspection Oilfield Services (IOS) [Member] | Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets			41,171
Inspection Oilfield Services (IOS) [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets			4,364
Inspection Oilfield Services (IOS) [Member] | Non-competition agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets			$ 2,178
TEW Holdings, LTD [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets				$ 14,048
TEW Holdings, LTD [Member] | Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets				870
TEW Holdings, LTD [Member] | Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets				10,035
TEW Holdings, LTD [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets				2,480
TEW Holdings, LTD [Member] | Non-competition agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets				$ 663

[1] As a result of the impact of the downturn within the energy markets, the expectations of a prolonged period before recovery, and the reduction in active U.S. land oil rig count, the Company performed an interim test for impairment of goodwill during the third quarter of 2015 that resulted in the full impairment of goodwill related to the IOS acquisition. Additionally, during the second quarter of 2016, the Company performed an interim impairment test due to further deterioration in projections that resulted in impairment of property, plant, and equipment and intangible assets as described in Notes 4 and 5.

[2] See Note 5 regarding intangible asset impairments.