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Summary of Significant Accounting Policies - Revenue Adjustment - Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Deferred commission expense | $ 40,352 | $ 39,643 | $ 31,443
Liabilities: |  |  |
Deferred revenue – upfront payments from right-to-use contracts |  | 108,982 |
Equity |  |  |
Distribution in excess of accumulated earnings |  | (227,166) | (211,980)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Assets |  |  |
Deferred commission expense |  |  | 31,443
Liabilities: |  |  |
Deferred revenue – upfront payments from right-to-use contracts |  |  | 85,596
Equity |  |  |
Distribution in excess of accumulated earnings |  |  | $ (211,980)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Assets |  |  |
Deferred commission expense |  | 8,200 |
Liabilities: |  |  |
Deferred revenue – upfront payments from right-to-use contracts |  | 23,386 |
Equity |  |  |
Distribution in excess of accumulated earnings |  | $ (15,186) |

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