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Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 26,998 | $ 30,650 | $ 84,160 | $ 92,700
Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 22,584 | 25,663 | 70,465 | 78,558
Products |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 1,051 | 1,278 | 3,319 | 3,838
General and administrative expenses |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 3,363 | $ 3,709 | $ 10,376 | $ 10,304

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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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. + Details
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