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Pension Plans And Other Postretirement Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2017
Components of Net Periodic Benefit Cost |
| Pension Benefits |  | Other Post-retirement Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016
Three months ended March 31: |  |  |  |  |  |  |
Service cost | $ | 5,042 |  |  | $ | 4,519 |  |  | $ | 824 |  |  | $ | 779 |
Interest cost | 6,951 |  |  | 6,900 |  |  | 1,399 |  |  | 1,559 |
Expected return on plan assets | (7,900 | ) |  | (6,750 | ) |  | (475 | ) |  | (475 | )
Amortization of prior service cost | — |  |  | — |  |  | (312 | ) |  | (312 | )
Net loss recognition | 2,546 |  |  | 1,890 |  |  | 1,273 |  |  | 1,365 |
Net periodic benefit cost | $ | 6,639 |  |  | $ | 6,559 |  |  | $ | 2,709 |  |  | $ | 2,916 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration