Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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):

	Six Months Ended June 30, 2016
(in thousands)	Hourly Employees’ Pension Plan				Employees’ Retirement Plan				Total
Service cost		$	4			$	2		$	6
Interest cost		200				444			644
Expected return on plan assets		(324		)		(598		)	(922		)
Amortization of net loss		142				220			362
Net periodic benefit cost		$	22			$	68		$	90

	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 net loss		124				200			324
Net periodic benefit cost		$	—			$	22		$	22