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Income Taxes and Related Payments - Components of deferred tax assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amortizable basis | $ 408,140 | $ 404,715 | $ 410,690
2018 Follow-On Offering | 30,967 | 20,303 | 120,320
Deferred Tax Assets, Exchanges | 13,424 | 16,199 |
Amortization | (31,872) | (29,851) |
Other Tax Expense (Benefit) | 21,873 | (10) |
Amounts payable under tax receivable agreements | 375,324 | 369,355 | 385,413
Establishment of Amounts Payable Under Tax Receivable Agreements | 11,410 | 13,770 |
Tax Receivable Agreement Payments | 24,998 | 36,111 | 30,234
Net (Gain) Loss On The Tax Receivable Agreements Other | 19,557 | (251) |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 78 | 115 |
Deferred tax assets: |  |  |
Amortizable basis | 408,140 | 404,715 | $ 410,690
Other | 27,757 | 24,413 |
Total deferred tax assets | 435,897 | 429,128 |
Less: valuation allowance | 0 | 0 |
Net deferred tax assets | $ 435,897 | $ 429,128 |
Tax rate used to measure deferred tax assets |  | 23.50% | 37.00%
Follow On Offering |  |  |
2018 Follow-On Offering |  | $ 7,687 |
Establishment of Amounts Payable Under Tax Receivable Agreements |  | $ 6,534 |

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