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Income Taxes - Deferred Portion of Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Accrued expenses, deducted for tax when paid | $ (19,115) | $ (17,797) | $ (21,884)
Capitalized costs for books, deducted for tax | 1,904 | 3,246 | (4,832)
Depreciation | 6,732 | 3,526 | 10,071
Other, net | (1,260) | 2,153 | 766
Deferred portion of the tax provision (benefit) | $ (11,739) | $ (8,872) | $ (15,879)

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