Other Assets - Composition of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Benefit plan-related assets	$ 84,600	$ 75,653
Non-current deferred tax assets	79,618	34,494
Other	58,027	46,222
Total other assets	$ 222,245	$ 156,369