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Employee benefit plans
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Pension and other postretirement benefit plans Employee benefit plans
Pension and other postretirement plans
The Company has noncontributory defined benefit pension plans and other postretirement benefit plans for certain eligible employees. Components of net periodic benefit cost (credit) for the Company's pension and other postretirement benefit plans were as follows:
 
Pension Benefits
Other
Postretirement Benefits
Three Months Ended September 30,
2017

2016

2017

2016

 
(In thousands)
Components of net periodic benefit cost (credit):
 
 
 
 
Service cost
$
—

$
—

$
377

$
412

Interest cost
4,052

4,305

816

922

Expected return on assets
(5,132
)
(5,231
)
(1,160
)
(1,133
)
Amortization of prior service credit
—

—

(343
)
(343
)
Amortization of net actuarial loss
1,589

1,553

213

371

Net periodic benefit cost (credit), including amount capitalized
509

627

(97
)
229

Less amount capitalized
65

82

(95
)
(34
)
Net periodic benefit cost (credit)
$
444

$
545

$
(2
)
$
263

 
Pension Benefits
Other
Postretirement Benefits
Nine Months Ended September 30,
2017

2016

2017

2016

 
(In thousands)
Components of net periodic benefit cost (credit):
 
 
 
 
Service cost
$
—

$
—

$
1,130

$
1,236

Interest cost
12,155

12,915

2,449

2,766

Expected return on assets
(15,395
)
(15,693
)
(3,480
)
(3,400
)
Amortization of prior service credit
—

—

(1,029
)
(1,029
)
Amortization of net actuarial loss
4,767

4,660

649

1,118

Net periodic benefit cost (credit), including amount capitalized
1,527

1,882

(281
)
691

Less amount capitalized
245

284

(248
)
4

Net periodic benefit cost (credit)
$
1,282

$
1,598

$
(33
)
$
687



Nonqualified benefit plans
In addition to the qualified plan defined pension benefits reflected in the table, the Company also has unfunded, nonqualified benefit plans for executive officers and certain key management employees that generally provide for defined benefit payments at age 65 following the employee's retirement or, upon death, to their beneficiaries for a 15-year period. In February 2016, the Company froze the unfunded, nonqualified defined benefit plans to new participants and eliminated benefit increases. Vesting for participants not fully vested was retained. The Company's net periodic benefit cost for these plans for the three and nine months ended September 30, 2017, was $1.2 million and $3.5 million, respectively. The Company's net periodic benefit cost for these plans for the three and nine months ended September 30, 2016, was $1.3 million and $600,000, respectively, which reflects a curtailment gain of $3.3 million in the first quarter of 2016.