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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