Employee Pension Plans (Tables)

6 Months Ended

Jun. 30, 2015

Employee Pension Plans [Abstract]

Components of Net Periodic Benefit Cost

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)				(in thousands)
Interest cost	$	1,011	$	1,030	$	2,022	$	2,060
Expected return on plan assets		(1,256)		(1,192)		(2,512)		(2,384)
Amortization of net loss		1,460		1,077		2,920		2,154
Net periodic benefit cost	$	1,215	$	915	$	2,430	$	1,830