Other Assets (Tables)

12 Months Ended

Dec. 31, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Other Assets

Other assets consist of the following (in thousands): 

	December 31,
	2017		2016
Benefit plan-related assets	$	97,525	$	45,958
Non-current deferred tax assets	31,067		27,275
Other	65,150		14,046
Total other assets	$	193,742	$	87,279