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Basis of Presentation and Significant Accounting Policies Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Operating Lease, Liability |  | $ 13,545 | $ 15,000
Fair Value, Option, Credit Risk, Gains (Losses) on Liabilities | $ 1,114 |  |
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Derivative [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 2,900 |  |
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Derivative [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (2,900) |  |
Deferred Income Tax Charge [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Derivative [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 590 |  |

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