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Concentration of Credit Risk and Significant Relationships (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 208,302 | $ 202,961 | $ 200,727 | $ 186,962 | $ 191,543 | $ 212,788 | $ 212,296 | $ 212,008 | $ 798,952 | $ 828,635 | $ 795,624
Total long-lived assets | 126,650 |  |  |  | 29,138 |  |  |  | 126,650 | 29,138 |
U.S. |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 666,650 | 698,994 | 679,331
Total long-lived assets | 121,146 |  |  |  | 28,313 |  |  |  | 121,146 | 28,313 |
Non-U.S. |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 132,302 | 129,641 | $ 116,293
Total long-lived assets | $ 5,504 |  |  |  | $ 825 |  |  |  | $ 5,504 | $ 825 |

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