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Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | [1] | Dec. 31, 2018 | [1] | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other expense | $ 394 | $ 281 | $ 456 | $ 455 | $ 436 | $ 527 | $ 543 | $ 238 | $ 1,586 | $ 1,744 | $ 2,028 | [1]
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other expense |  |  |  |  |  |  |  |  |  |  | $ 2,000 |
[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 years ended December 31, 2019 and 2018, and we reclassified $2.0 million from operating expenses to other expense for 2017 to conform with current period presentation.

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- Definition Amount of expense classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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