Pension Plan (Tables)

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Schedule of net benefit cost

Net periodic pension cost consists of the following: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Service cost	$	253		$	169		$	506		$	338
Interest cost on projected benefit obligation	782			701			1,564			1,403
Expected return on plan assets	(1,181		)	(1,354		)	(2,362		)	(2,709		)
Net amortization and deferral	720			672			1,440			1,344
Net periodic pension cost	$	574		$	188		$	1,148		$	376