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Pension Plans and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Pension Plans and Other Postretirement Benefits
Pension Plans and Other Postretirement Benefits:
The components of pension and postretirement benefits cost (credit) for the three-month and six-month periods ended June 30, 2016 and 2015 were as follows (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Pension Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
1,233

 
$
1,143

 
$
2,281

 
$
2,626

Interest cost
9,498

 
9,710

 
18,863

 
18,251

Expected return on assets
(10,337
)
 
(11,753
)
 
(20,509
)
 
(21,965
)
Actuarial gain
—

 
(51
)
 
(50
)
 
(51
)
Amortization of prior service benefit
440

 
29

 
468

 
59

Total net pension benefits cost (credit)
$
834

 
$
(922
)
 
$
1,053

 
$
(1,080
)
Postretirement Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
28

 
$
5

 
$
57

 
$
71

Interest cost
621

 
619

 
1,242

 
1,287

Expected return on assets
(47
)
 
(47
)
 
(94
)
 
(131
)
Amortization of prior service benefit
(24
)
 
(24
)
 
(48
)
 
(48
)
Total net postretirement benefits cost
$
578

 
$
553

 
$
1,157

 
$
1,179

Total net pension and postretirement benefits cost (credit)(a)
$
1,412

 
$
(369
)
 
$
2,210

 
$
99


(a)
For the three-month and six-month periods ended June 30, 2016, $0.6 million and $1.2 million, respectively, of net pension and postretirement benefits cost are included in (Loss) income from discontinued operations (net of tax) in the consolidated statements of (loss) income. For the three-month and six-month periods ended June 30, 2015, $0.8 million and ($1.2) million, respectively, of net pension and postretirement benefits cost (credit) are included in (Loss) income from discontinued operations (net of tax) in the consolidated statements of (loss) income. See Note 3, “Divestitures,” for additional information.
During the three-month and six-month periods ended June 30, 2016, we made contributions of $4.5 million and $7.9 million, respectively, to our qualified and nonqualified pension plans related to continuing and discontinued operations. During the three-month and six-month periods ended June 30, 2015, we made contributions of $4.5 million and $9.1 million, respectively, to our qualified and nonqualified pension plans related to continuing and discontinued operations.
We paid $0.8 million and $1.6 million in premiums to the U.S. postretirement benefit plan during the three-month and six-month periods ended June 30, 2016, respectively. During the three-month and six-month periods ended June 30, 2015, we paid $0.5 million and $1.9 million, respectively, in premiums to the U.S. postretirement benefit plan.
Multiemployer Plan
Our contributions to the Pensionskasse Dynamit Nobel Versicherungsverein auf Gegenseitigkeit, Troisdorf (“DN Pensionskasse”) multiemployer plan for continuing and discontinued operations were €0.4 million and €0.9 million (approximately $0.5 million and $1.0 million) during the three-month and six-month periods ended June 30, 2016, respectively. During the three-month and six-month periods ended June 30, 2015, we made contributions of €0.4 million and €0.7 million (approximately $0.4 million and $0.8 million), respectively, to the DN Pensionskasse multiemployer plan for continuing and discontinued operations.
Effective July 1, 2016, the DN Pensionskasse is subject to a financial improvement plan which expires in 2023. This financial improvement plan calls for increased capital reserves to avoid future underfunding risk.