Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Net Periodic Benefit Credit for Defined Benefit Plans

The net periodic benefit credit for the defined benefit plans includes the following components:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2015			2014			2015			2014
Service cost	$	17		$	16		$	34		$	32
Interest cost		1,477			1,596			2,954			3,192
Expected return on plan assets		(2,491	)		(2,487	)		(4,982	)		(4,974	)
Amortization:
Unrecognized net transition asset		—			(5	)		—			(10	)
Unrecognized prior service cost		2			2			4			4
Unrecognized loss		536			337			1,072			674
Net periodic pension credit	$	(459	)	$	(541	)	$	(918	)	$	(1,082	)