Pension Plan (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of net benefit cost

Net periodic pension cost consists of the following: 

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Service cost	$	113		$	60		$	339		$	180
Interest cost on projected benefit obligation	719			849			2,158			2,546
Expected return on plan assets	(1,297		)	(1,424		)	(3,892		)	(4,273		)
Net amortization and deferral	695			808			2,085			2,425
Net periodic pension cost	$	230		$	293		$	690		$	878