Income Taxes - Balance Sheet Classification of Net Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Noncurrent assets	$ 0	$ 2,518
Noncurrent liabilities	(5,066)	(13,707)
Net deferred income tax asset (liability)	$ (5,066)	$ (11,189)