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Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017
Revenue Recognition [Abstract] |  |  |  |  |
Revenue | $ 623,500 | $ 704,190 | $ 1,247,123 | $ 1,320,409 |
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 | $ 600 | $ (700) | $ 1,100 | $ 600 |

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