Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2015

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):

	Six Months Ended June 30, 2015
(in thousands)	Hourly Employees’ Pension Plan				Employees’ Retirement Plan				Total
Service cost		$	4			$	2		$	6
Interest cost		202				434			636
Expected return on plan assets		(330		)		(614		)	(944		)
Amortization of prior service cost		—				—			—
Amortization of net (gain)/loss		124				200			324
Net periodic benefit cost		$	—			$	22		$	22

	Six Months Ended June 30, 2014
(in thousands)	Hourly Employees’ Pension Plan				Employees’ Retirement Plan				Total
Service cost		$	4			$	2		$	6
Interest cost		210				426			636
Expected return on plan assets		(318		)		(590		)	(908		)
Amortization of prior service cost		—				—			—
Amortization of net (gain)/loss		36				30			66
Net periodic benefit income		$	(68	)		$	(132	)	$	(200	)