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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Contract Assets |  |  |
Balance at beginning of period | $ 2,736 | $ 10,213 | $ 10,213
Change due to acquisitions / disposals | 7,469 |  | 6,573
Change related to credit allowance | (79) |  |
Other changes in the period | 15,256 |  | (14,050)
Balance at end of period | 25,382 |  | 2,736
Contract Liabilities |  |  |
Balance at beginning of period | 166,918 | 130,986 | 130,986
Change due to acquisitions / disposals | 37,047 |  | 31,556
Other changes in the period | 13,489 |  | 4,376
Balance at end of period | 217,454 |  | $ 166,918
Revenue related to our contract liabilities | $ 164,400 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Contract Liabilities |  |  |
Revenue related to our contract liabilities |  | $ 123,300 |

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