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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating Lease, Right-of-Use Asset | $ 68,131 | $ 0 |  | $ 60,600
Operating Lease, Liability, Current | 15,850 | 0 |  | 12,000
Operating Lease, Liability, Noncurrent | 53,919 | 0 |  | 50,700
Goodwill, Impairment Loss | $ 25,784 | $ 0 | $ 0 |
Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 2,800

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