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Defined Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Defined Benefit Plans | Defined Benefit Plans The components of the combined net periodic expense (benefit) for our defined benefit pension plans are presented in the table below.
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Expected return on plan assets, net of expenses | $ | (2,693 | ) |  | $ | (2,979 | ) |  | $ | (5,386 | ) |  | $ | (5,958 | )
Interest cost on projected benefit obligation | 1,618 |  |  | 1,474 |  |  | 3,236 |  |  | 2,949 |
Net amortization and deferral | 1,406 |  |  | 1,251 |  |  | 2,812 |  |  | 2,501 |
Net periodic expense (benefit) | $ | 331 |  |  | $ | (254 | ) |  | $ | 662 |  |  | $ | (508 | )
Our non-qualified defined benefit pension plan is not funded. No contributions to the qualified defined benefit pension plan were made during the six months ended June 30, 2019. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2019.

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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 + Details
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