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Post-retirement Plan
 6 Months Ended
Jun. 30, 2015
Pension and Other Postretirement Benefit Expense [Abstract]  
Post-retirement Plans
Post-retirement Plans

We have a post-retirement healthcare and other benefits plan that is available to certain of our employees who satisfy certain age and service requirements. The net periodic benefit credit of this plan consisted of the following components:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
(In thousands)
Service cost – benefit earned during the period
 
$
424

 
$
224

 
$
848

 
$
448

Interest cost on projected benefit obligations
 
205

 
160

 
410

 
319

Amortization of prior service credit
 
(871
)
 
(1,074
)
 
(1,742
)
 
(2,148
)
Amortization of net loss
 
46

 
—

 
92

 
—

Net periodic post-retirement credit
 
$
(196
)
 
$
(690
)
 
$
(392
)
 
$
(1,381
)

Additionally, we had a program that provided transition benefit payments to certain employees that participated in a previously terminated defined benefit plan. The program extended through 2014 and provided payments subsequent to year-end provided the employee was employed by us on the last day of each year. The payments are based on each employee's years of service and eligible salary. Transition benefit costs under this program were $2.9 million for the three months ended June 30, 2014 and $5.5 million for the six months ended June 30, 2014. In March 2015, we paid all remaining amounts owed to plan participants of $11.0 million.