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Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic pension cost
The components of net periodic pension cost for these defined benefit pension plans are as follows:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Service cost
$
8,299

 
$
8,430

 
$
16,715

 
$
16,770

Interest cost
1,226

 
1,013

 
2,469

 
2,020

Expected return on plan assets
(1,417
)
 
(1,133
)
 
(2,859
)
 
(2,261
)
Amortization of prior service cost
—

 
—

 
—

 
31

Recognized actuarial (gain) loss
(42
)
 
22

 
(77
)
 
44

Net periodic pension cost
$
8,066

 
$
8,332

 
$
16,248

 
$
16,604
Summary of defined contribution expense
The following table summarizes our defined contribution expense:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Defined contribution expense
$
3,017

 
$
2,581

 
$
7,013

 
$
5,779