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Employee Benefit Plans
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Service cost
$
57

 
$
50

 
$
114

 
$
99

Interest cost
242

 
220

 
485

 
441

Expected return on plan assets
(313
)
 
(278
)
 
(626
)
 
(557
)
Amortization of net actuarial loss/prior service cost
70

 
194

 
139

 
388

Net periodic cost recognized
$
56

 
$
186

 
$
112

 
$
371

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

 
$
1

 
$
—

 
$
1

Interest cost
1

 
1

 
2

 
2

Amortization of net actuarial gain/prior service credit
(15
)
 
(117
)
 
(29
)
 
(234
)
Net periodic benefit recognized
$
(14
)
 
$
(115
)
 
$
(27
)
 
$
(231
)

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 for each of the three months ended June 30, 2014 and 2013 and $0.5 million for each of the six months ended June 30, 2014 and 2013.