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Basis of Presentation and Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Leased Assets [Line Items] |  |  |
Operating lease right-of-use assets | $ 60,149 | $ 60,600 | $ 0
Accrued liabilities and other | 12,659 | 12,000 |
Operating lease liabilities | 49,632 | 50,700 | $ 0
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 2,843 |  |
Accounting Standards Update 2016-02 |  |  |
Operating Leased Assets [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 2,800 |

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