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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred revenue | $ 700 |  |  |  |  |  |
Deferred expense | 300 |  |  |  |  | $ 400 |
Decrease to retained earnings | $ (84,728) | $ (83,421) | $ (77,338) | $ (75,554) | $ (72,360) |  | $ (71,453)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  | 700 |
Decrease to retained earnings |  |  |  |  |  | $ 300 |

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