Retirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Cost

The following tables present the components of net periodic benefit cost (gains are denoted with parentheses and losses are not):

	Three Months Ended March 31, 2016
(in thousands)	Hourly Employees’ Pension Plan				Employees’ Retirement Plan				Total
Service cost		$	2			$	1		$	3
Interest cost		100				222			322
Expected return on plan assets		(162		)		(299		)	(461		)
Amortization of net loss		71				110			181
Net periodic benefit cost		$	11			$	34		$	45

	Three Months Ended March 31, 2015
(in thousands)	Hourly Employees’ Pension Plan				Employees’ Retirement Plan				Total
Service cost		$	2			$	1		$	3
Interest cost		101				217			318
Expected return on plan assets		(165		)		(307		)	(472		)
Amortization of net loss		62				100			162
Net periodic benefit cost		$	—			$	11		$	11