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Organization and Principles of Consolidation Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 30,903
Accounting Standards Update 2016-02 [Member] | Salaries expense [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 6,500 |
Accounting Standards Update 2016-02 [Member] | Legal expense [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 1,600 |

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