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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract] |
Components Of Net Periodic Benefit Expense |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 837 |  |  | $ | 785 |  |  | $ | 1,673 |  |  | $ | 1,570 |
Interest cost on projected benefit obligation |  |  | 597 |  |  |  | 614 |  |  |  | 1,195 |  |  |  | 1,227 |
Expected return on plan assets |  |  | (1,321 | ) |  |  | (1,194 | ) |  |  | (2,642 | ) |  |  | (2,388 | )
Amortization of unrecognized prior service credit |  |  | (18 | ) |  |  | (13 | ) |  |  | (36 | ) |  |  | (26 | )
Amortization of unrecognized net actuarial loss |  |  | 188 |  |  |  | 291 |  |  |  | 375 |  |  |  | 583 |
Net periodic benefit expense |  | $ | 283 |  |  | $ | 483 |  |  | $ | 565 |  |  | $ | 966 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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