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Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Plans [Abstract] |
Components of Net Periodic Benefits Cost |
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﻿(in thousands) |  | Pension Benefits |  | Retirement Benefits
﻿Three Months Ended September 30, 2018 |  | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Service cost |  | $ | 3,163 |  | $ | 3,769 |  | $ | 28 |  | $ | 17
﻿Interest cost |  |  | 4,279 |  |  | 4,056 |  |  | 161 |  |  | 155
﻿Expected return on plan assets |  |  | (10,375) |  |  | (9,652) |  |  | — |  |  | —
﻿Amortization of net loss and prior service costs |  |  | 1,366 |  |  | 1,167 |  |  | (95) |  |  | (128)
﻿Net periodic benefit cost (reduction of cost) |  | $ | (1,567) |  | $ | (660) |  | $ | 94 |  | $ | 44
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﻿ |  |  |  |  |  |  |  | Other Post-
﻿(in thousands) |  | Pension Benefits |  | Retirement Benefits
﻿Nine Months Ended September 30, 2018 |  | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Service cost |  | $ | 9,251 |  |  | 11,612 |  | $ | 91 |  |  | 112
﻿Interest cost |  |  | 12,481 |  |  | 12,470 |  |  | 459 |  |  | 514
﻿Expected return on plan assets |  |  | (30,244) |  |  | (27,978) |  |  | — |  |  | —
﻿Amortization of net loss and prior service costs |  |  | 4,057 |  |  | 4,368 |  |  | (338) |  |  | (224)
﻿Net periodic benefit cost (reduction of cost) |  | $ | (4,455) |  | $ | 472 |  | $ | 212 |  | $ | 402
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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=82843861&loc=d3e1928-114920 + Details
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