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Summary of Significant Accounting Policies, Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other Liabilities [Abstract] |  |
Deferred tax liabilities | $ 10,741 | $ 18,236
Reserve for other tax liabilities | 17,121 | 14,382
Liability for deferred compensation plan | 43,238 | 36,398
Pension plan benefits reserve | 3,454 | 3,023
Build to suit - financing obligation | 0 | 9,332
Deferred rent and deferred tenant incentives | 0 | 5,665
Asset retirement obligation | 6,631 | 6,444
Other | 15,610 | 18,436
Total other liabilities | $ 96,795 | $ 111,916

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