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Overview and Basis of Presentation - Impact of Adopting ASU 2017-07 on Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Corporate activities |  | $ 3,777 | $ 4,425 | $ 8,529 | $ 9,886
Other expense | [1] | 527 | 248 | 1,308 | 922
As Previously Reported |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Corporate activities |  |  | 4,474 |  | 10,092
ASU 2017-07 |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Corporate activities |  |  | (49) |  | (206)
Other expense |  |  | 248 |  | 922
Services |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  | 254,638 | 245,757 | 792,775 | 808,304
Services | As Previously Reported |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  |  | 254,963 |  | 813,456
Services | Reclassifications to Conform with Revenue Presentation |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  |  | (9,007) |  | (4,436)
Services | ASU 2017-07 |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  |  | (199) |  | (716)
Products |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  | $ 46,974 | 46,077 | $ 122,529 | 121,508
Products | As Previously Reported |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  |  | 37,070 |  | 117,072
Products | Reclassifications to Conform with Revenue Presentation |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cost of services and products |  |  | $ 9,007 |  | $ 4,436
[1] | We adopted ASU 2017-07 on January 1, 2018, which requires retrospective adoption. As a result, we recorded the nonservice cost component of net periodic benefit cost within other expense for the three and nine months ended September 30, 2018, and we reclassified $0.2 million from operating expenses to other expense for the three months ended September 30, 2017 and $0.9 million for the nine months ended September 30, 2017 to conform with current period presentation. Refer to Note 1 – Overview and Basis of Presentation for additional details on the impact of this adoption on our Condensed Consolidated Statements of Operations.

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