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Revenue and Related Contract Costs and Contract Liabilities - Balance Sheet Reclassifications made to Separately Present Contract Costs and Contract Liabilities in Connection with Adoption of Topic 606 (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disaggregation Of Revenue [Line Items] |  |  |
Reclassification of customer deposits to contract liabilities | $ 33,476 | $ 31,981 | [1]
Accounting Standards Update 2014-09 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Reduction in total current assets |  | 700 |
Accounting Standards Update 2014-09 | Reclassification of Customer Deposits to Contract Liabilities |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Reclassification of customer deposits to contract liabilities |  | $ 33,400 |
Accounting Standards Update 2014-09 | Core Services |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Deferred costs included in other investments and assets | $ 3,500 |  |
[1] | In connection with the adoption of Topic 606, we elected to more prominently present contract liabilities on the Consolidated Balance Sheets. Consequently, customer deposits of $33.4 million as of December 31, 2017, have been reclassified to “Contract liabilities” and to other certain current liabilities to conform to the current period presentation.

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