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Retirement Benefit Plans

3 Months Ended

Sep. 30, 2019

Retirement Benefit Plans

Retirement Benefit Plans

8. Retirement Benefit Plans

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We sponsor various retirement benefit plans including qualified and nonqualified defined benefit pension plans for our employees. The components of net periodic pension expense are as follows (in thousands):

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​	​	​	​	​	​	​
​	​	Three Months Ended September 30,
​		2018		​	2019
Service cost	​	$	98	​	$	100
Interest cost	​	​	8	​	​	8
Amortization of prior service cost	​		14	​		13
Net periodic pension expense	​	$	120	​	$	121

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During each of the three months ended September 30, 2018 and 2019, we made no contributions to these defined benefit plans.

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We also maintain various defined contribution plans. During each of the three month periods ended September 30, 2018 and 2019, we made contributions totaling $1.8 million to these defined contribution plans.

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- References

No definition available.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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