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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ 732,217 |  | $ 684,540
Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ 732,217 | $ 688,752 |
Minimum |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Remaining performance obligation, expected timing of satisfaction, period | 30 days |  |
Maximum |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Remaining performance obligation, expected timing of satisfaction, period | 105 days |  |

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