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Income Taxes - Deferred Portion of Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Accrued expenses, deducted for tax when paid | $ (21,884) | $ 15,213 | $ (6,889)
Capitalized costs for books, deducted for tax | (4,832) | (5,790) | 5,901
Depreciation | 10,071 | (4,079) | (2,405)
Tax effects of TCJA | 0 | 34,633 | 0
Other, net | 766 | 1,835 | 1,525
Deferred portion of the tax provision (benefit) | $ (15,879) | $ 41,812 | $ (1,868)

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