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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
The Company is the sponsor of three defined benefit plans that are frozen and no additional benefits are accruing thereunder. Two of the Company's defined benefit pension plans cover certain employees at designated repair facilities. The assets of these defined benefit pension plans are held by independent trustees and consist primarily of equity and fixed income securities. The Company also sponsors an unfunded, non-qualified supplemental executive retirement plan that covers several of the Company's current and former employees. The Company provides postretirement life insurance benefits for certain of its union employees who retired after attaining specified age and service requirements. The Company also previously sponsored a postretirement medical benefit plan that provided access to healthcare for certain retired employees, however, this plan was terminated effective December 31, 2013.
The components of net periodic benefit cost for the pension and postretirement plans are as follows: 
 
Pension Benefits
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Service cost
$
56

 
$
49

 
$
170

 
$
148

Interest cost
243

 
221

 
728

 
662

Expected return on plan assets
(313
)
 
(279
)
 
(939
)
 
(836
)
Amortization of net actuarial loss/prior service cost
69

 
194

 
208

 
582

Net periodic cost recognized
$
55

 
$
185

 
$
167

 
$
556

 
 
Postretirement Benefits
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Service cost
$
—

 
$
—

 
$
—

 
$
1

Interest cost
—

 
1

 
2

 
3

Amortization of net actuarial gain/prior service credit
(14
)
 
(117
)
 
(43
)
 
(351
)
Net periodic benefit recognized
$
(14
)
 
$
(116
)
 
$
(41
)
 
$
(347
)

The Company also maintains qualified defined contribution plans, which provide benefits to its eligible employees based on employee contributions, years of service, and employee earnings with discretionary contributions allowed. Expenses related to these plans were $0.3 million and $0.2 million for the three months ended September 30, 2014 and 2013, respectively, and $0.7 million for each of the nine months ended September 30, 2014 and 2013.