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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
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.