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Assets and Liabilities Held for Sale - Analysis of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Assets and Liabilities Held for Sale [Line Items] |  |
Assets held for sale | $ 35,447 | $ 0
Liabilities held for sale | 403 | $ 0
Disposal Group, Held-for-sale, Not Discontinued Operations | Corporate Headquarters Building |  |
Assets and Liabilities Held for Sale [Line Items] |  |
Net carrying amount before impairment | 73,447 |
Less: asset write-down to fair value | (37,947) |
Less: estimated cost of sale | (53) |
Subtotal impairment charges | 38,000 |
Assets held for sale | 35,447 |
Accounts payable held for sale | 6 |
Accrued expenses held for sale | 397 |
Liabilities held for sale | $ 403 |

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