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Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 28,862	$ 30,951	$ 57,162	$ 62,050
Services
Property, Plant and Equipment [Line Items]
Depreciation and amortization	24,302	26,252	47,881	52,895
Products
Property, Plant and Equipment [Line Items]
Depreciation and amortization	1,131	1,252	2,268	2,561
General and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 3,429	$ 3,447	$ 7,013	$ 6,594

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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