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Overview and Summary of Significant Accounting Policies - Impact of Adopting ASU 2017-07 on Consolidated Statement of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Corporate activities |  | $ 10,993 | $ 12,396 | $ 9,592
Other expense | [1] | 1,744 | 2,028 | 1,656
As Previously Reported |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Corporate activities |  |  | 12,877 | 10,322
ASU 2017-07 |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Corporate activities |  |  | (481) | (730)
Other expense |  |  | 2,028 | 1,656
Services |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  | 1,039,403 | 1,052,911 | 966,568
Services | As Previously Reported |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  |  | 1,050,547 | 954,667
Services | Reclassifications to Conform with Revenue Presentation |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  |  | 3,911 | 12,827
Services | ASU 2017-07 |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  |  | (1,547) | (926)
Products |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  | $ 168,799 | 158,081 | 152,291
Products | As Previously Reported |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  |  | 161,992 | 165,118
Products | Reclassifications to Conform with Revenue Presentation |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cost of services and products |  |  | $ (3,911) | $ (12,827)
[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 year ended December 31, 2018, and we reclassified $2.0 million from operating expenses to other expense for 2017 and $1.7 million for 2016 to conform with current period presentation. Refer to Note 1 – Overview and Summary of Significant Accounting Policies for additional details on the impact of this adoption on our Consolidated Statements of Operations.

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