Employee Benefit Plans

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Employee Benefit Plans

Pension Plans

The Company is the sponsor of three defined benefit plans that are frozen, and no additional benefits are accruing thereunder. Two of the Company's defined benefit pension plans cover certain employees at designated repair facilities. The assets of these defined benefit pension plans are held by independent trustees and consist primarily of equity and fixed income securities. The Company also sponsors an unfunded, non-qualified supplemental executive retirement plan that covers several of the Company's current and former employees.

The components of net periodic benefit cost for the pension plans are as follows:

	Pension Benefits
	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	85		$	88		$	254		$	265
Interest cost	210			235			631			706
Expected return on plan assets	(281		)	(283		)	(843		)	(848		)
Amortization of net actuarial loss/prior service cost	46			184			137			552
Net periodic cost recognized	$	60		$	224		$	179		$	675