XML 30 R19.htm IDEA: XBRL DOCUMENT v3.7.0.1
Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Income for the Pension Plans

Net periodic benefit income for the pension plans included the following components for the three months ended March 31:
 
 
Pension Benefits
 
2017
 
2016
 
(in thousands)
Service cost
$
2,157

 
$
2,027

Interest cost
24,132

 
26,091

Expected return on plan assets
(39,733
)
 
(39,138
)
Amortization of prior service credit
(88
)
 
(108
)
Amortization of actuarial loss
9,485

 
7,795

Net periodic benefit income
$
(4,047
)
 
$
(3,333
)