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Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Revenue Recognition [Abstract] |  |  |  |  |
Revenue | $ 589,934 | $ 675,312 | $ 1,837,057 | $ 1,995,721 |
ASC Topic 606 [Member] |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |
Cumulative impact on opening retained earnings |  |  |  |  | $ 13,000
Impact of Adopting ASC Topic 606 [Member] | ASC Topic 606 [Member] |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |
Revenue | $ 0 | $ (100) | $ 1,100 | $ 700 |

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