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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Costs of services |  | $ 257,295 | $ 280,638
Costs of products |  | 31,122 | 32,102
Corporate activities |  | 2,217 | 2,541
Other expense | [1] | $ 238 | 452
Reclassifications to Conform with Revenue Presentation |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Costs of services |  |  | 7,412
Costs of products |  |  | (7,412)
As Previously Reported |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Costs of services |  |  | 273,609
Costs of products |  |  | 39,514
Corporate activities |  |  | 2,610
ASU 2017-07 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Costs of services |  |  | (383)
Corporate activities |  |  | (69)
Other expense |  |  | $ 452
[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 months ended March 31, 2018, and we reclassified $0.5 million from operating expenses to other expense for the three months ended March 31, 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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