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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Retirement Benefit Plans [Abstract] |
Changes in Benefit Obligations and Plan Assets |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿(in thousands) |  | Pension Benefits |  | Other Post- retirement Benefits
﻿Change in benefit obligation |  |  |  |  |  |  |  |  |  |  |  |
﻿Benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |
﻿at beginning of year |  | $ | 462,819 |  | $ | 456,911 |  | $ | 22,281 |  | $ | 28,368
﻿Service cost |  |  | 14,098 |  |  | 13,511 |  |  | 170 |  |  | 117
﻿Interest cost |  |  | 16,907 |  |  | 18,635 |  |  | 773 |  |  | 891
﻿Plan participants' contributions |  |  | — |  |  | — |  |  | 1,269 |  |  | 1,334
﻿Plan amendments |  |  | — |  |  | — |  |  | (1,224) |  |  | —
﻿Net actuarial (gain) loss |  |  | 16,944 |  |  | (8,154) |  |  | 1,844 |  |  | (5,905)
﻿Benefits paid |  |  | (31,487) |  |  | (18,084) |  |  | (2,632) |  |  | (2,524)
﻿Benefit obligation, end of year |  |  | 479,281 |  |  | 462,819 |  |  | 22,481 |  |  | 22,281
﻿Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |
﻿Fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |
﻿at beginning of year |  |  | 491,550 |  |  | 438,708 |  |  | — |  |  | —
﻿Actual return on plan assets |  |  | 40,375 |  |  | (14,421) |  |  | — |  |  | —
﻿Employer contributions |  |  | 16,123 |  |  | 86,123 |  |  | 1,363 |  |  | 1,190
﻿Plan participants' contributions |  |  | — |  |  | — |  |  | 1,269 |  |  | 1,334
﻿Benefit payments |  |  | (31,487) |  |  | (18,084) |  |  | (2,632) |  |  | (2,524)
﻿Expenses |  |  | (1,006) |  |  | (776) |  |  | — |  |  | —
﻿Fair value of plan assets, end of year |  |  | 515,555 |  |  | 491,550 |  |  | — |  |  | —
﻿Funded status at end of year - net asset (liability) |  | $ | 36,274 |  | $ | 28,731 |  | $ | (22,481) |  | $ | (22,281)
﻿Amounts recognized in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |
﻿Unrecognized loss: |  |  |  |  |  |  |  |  |  |  |  |
﻿at beginning of year |  | $ | 109,565 |  | $ | 72,858 |  | $ | (2,553) |  | $ | 3,358
﻿Net actuarial loss (gain) |  |  | 6,345 |  |  | 36,707 |  |  | 475 |  |  | (5,911)
﻿Unrecognized loss at end of year |  | $ | 115,910 |  | $ | 109,565 |  | $ | (2,078) |  | $ | (2,553)
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Projected benefit obligation |  | $ | 479,281 |  | $ | 462,819 |  |  |  |  |  |
﻿Accumulated benefit obligation |  |  | 443,261 |  |  | 429,338 |  |  |  |  |  |
﻿Fair value of plan assets |  |  | 515,555 |  |  | 491,550 |  |  |  |  |  |
﻿ ﻿
Components of Net Periodic Benefits Cost |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
﻿($ in thousands) |  | Pension benefits |  | Other post-retirement benefits
﻿Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Service cost |  | $ | 14,098 |  | $ | 13,511 |  | $ | 12,920 |  | $ | 170 |  | $ | 117 |  | $ | 126
﻿Interest cost |  |  | 16,907 |  |  | 18,635 |  |  | 19,251 |  |  | 773 |  |  | 891 |  |  | 1,140
﻿Expected return on plan assets |  |  | (34,554) |  |  | (32,833) |  |  | (32,222) |  |  | — |  |  | — |  |  | —
﻿Amortization of net loss/ prior service cost |  |  | 5,783 |  |  | 3,169 |  |  | 26 |  |  | 145 |  |  | 6 |  |  | 364
﻿Net periodic benefit cost |  |  | 2,234 |  |  | 2,482 |  |  | (25) |  |  | 1,088 |  |  | 1,014 |  |  | 1,630
﻿Other changes in plan assets and benefit obligations recognized in other comprehensive income, before taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net (loss) gain recognized during the year |  |  | (5,783) |  |  | (3,169) |  |  | (26) |  |  | (145) |  |  | (6) |  |  | (364)
﻿Net actuarial loss (gain) |  |  | 12,128 |  |  | 39,876 |  |  | 44,599 |  |  | 620 |  |  | (5,905) |  |  | (3,467)
﻿Total recognized in other comprehensive income |  |  | 6,345 |  |  | 36,707 |  |  | 44,573 |  |  | 475 |  |  | (5,911) |  |  | (3,831)
﻿Total recognized in net periodic benefit cost and other comprehensive income |  | $ | 8,579 |  | $ | 39,189 |  | $ | 44,548 |  | $ | 1,563 |  | $ | (4,897) |  | $ | (2,201)
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Discount rate for benefit obligations |  |  | 4.10% |  |  | 4.40% |  |  | 4.11% |  |  | 3.95% |  |  | 4.32% |  |  | 4.02%
﻿Discount rate for net periodic benefit cost |  |  | 4.40% |  |  | 4.11% |  |  | 4.73% |  |  | 4.32% |  |  | 4.02% |  |  | 4.58%
﻿Expected long-term return on plan assets |  |  | 7.25% |  |  | 7.50% |  |  | 7.50% |  |  | n/a |  |  | n/a |  |  | n/a
﻿Rate of compensation increase |  |  | scaled * |  |  | scaled * |  |  | scaled * |  |  | n/a |  |  | n/a |  |  | n/a
﻿ * Graded scale, declining from 7.00% at age 20 to 2.00% at age 60
Expected Plan Benefit Payments |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | Pension |  | Post-retirement |  | Total
﻿2017 |  | $ | 19,978 |  | $ | 1,421 |  | $ | 21,399
﻿2018 |  |  | 21,016 |  |  | 1,464 |  |  | 22,480
﻿2019 |  |  | 21,887 |  |  | 1,469 |  |  | 23,356
﻿2020 |  |  | 22,907 |  |  | 1,439 |  |  | 24,346
﻿2021 |  |  | 23,818 |  |  | 1,492 |  |  | 25,310
﻿2022-2026 |  |  | 134,294 |  |  | 6,775 |  |  | 141,069
﻿ |  | $ | 243,900 |  | $ | 14,060 |  | $ | 257,960
﻿
Assumed Health Care Cost Trend Rates |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 1% Decrease |  | Assumed |  | 1% Increase
﻿(in thousands) |  | in Rates |  | Rates |  | in Rates
﻿Aggregated service and interest cost |  | $ | 866 |  | $ | 943 |  | $ | 1,036
﻿Postretirement benefit obligation |  |  | 20,821 |  |  | 22,481 |  |  | 24,483
﻿
Fair Values of Pension Plan Assets |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  | December 31, 2016
﻿Fair Value Measurements by Asset Category / Fund |  |  |  | (Level 1) |  |  | (Level 2) |  | Total
﻿(in thousands) |  |  |  |  |  |  |  |  |  |
﻿Cash and equivalents |  |  | $ | 15,568 |  | $ | — |  | $ | 15,568
﻿ Total cash and cash equivalents |  |  |  | 15,568 |  |  | — |  |  | 15,568
﻿ |  |  |  |  |  |  |  |  |  |
﻿Fixed income securities |  |  |  | — |  |  | 136,085 |  |  | 136,085
﻿Mutual fund-fixed income |  |  |  | 48,805 |  |  | — |  |  | 48,805
﻿ Total fixed income |  |  |  | 48,805 |  |  | 136,085 |  |  | 184,890
﻿ |  |  |  |  |  |  |  |  |  |
﻿Domestic and foreign stock |  |  |  | 104,455 |  |  | 6 |  |  | 104,461
﻿Mutual funds-equity |  |  |  | 157,630 |  |  | — |  |  | 157,630
﻿ Total equity |  |  |  | 262,085 |  |  | 6 |  |  | 262,091
﻿ |  |  |  |  |  |  |  |  |  |
﻿Real assets fund |  |  |  | 27,690 |  |  | — |  |  | 27,690
﻿ Total assets at fair value |  |  |  | 354,148 |  |  | 136,091 |  |  | 490,239
﻿Common trust fund (fixed income) |  |  |  | — |  |  | — |  |  | 25,316
﻿Total |  |  | $ | 354,148 |  | $ | 136,091 |  | $ | 515,555
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  | December 31, 2015
﻿Fair Value Measurements by Asset Category / Fund |  |  |  | (Level 1) |  |  | (Level 2) |  |  | Total
﻿(in thousands) |  |  |  |  |  |  |  |  |  |
﻿Cash and equivalents |  |  | $ | 44,224 |  | $ | — |  | $ | 44,224
﻿ Total cash and cash equivalents |  |  |  | 44,224 |  |  | — |  |  | 44,224
﻿ |  |  |  |  |  |  |  |  |  |
﻿Fixed income securities |  |  |  | — |  |  | 105,721 |  |  | 105,721
﻿Mutual fund-fixed income |  |  |  | 47,453 |  |  | — |  |  | 47,453
﻿ Total fixed income |  |  |  | 47,453 |  |  | 105,721 |  |  | 153,174
﻿ |  |  |  |  |  |  |  |  |  |
﻿Domestic and foreign stock |  |  |  | 97,895 |  |  | 10 |  |  | 97,905
﻿Mutual funds-equity |  |  |  | 147,051 |  |  | — |  |  | 147,051
﻿ Total equity |  |  |  | 244,946 |  |  | 10 |  |  | 244,956
﻿ |  |  |  |  |  |  |  |  |  |
﻿Real assets fund |  |  |  | 24,653 |  |  | — |  |  | 24,653
﻿ Total assets at fair value |  |  |  | 361,276 |  |  | 105,731 |  |  | 467,007
﻿Common trust fund (fixed income) |  |  |  | — |  |  | — |  |  | 24,543
﻿Total |  |  | $ | 361,276 |  | $ | 105,731 |  | $ | 491,550
﻿
Percentage and Target Allocations |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Plan Assets |  |  |  | Target Allocation
﻿ |  | at December 31, |  |  |  | at December 31,
﻿Asset category |  | 2016 |  |  | 2015 |  |  |  | 2016 |  |  | 2015
﻿ Cash and equivalents |  | 3 | % |  | 9 | % |  |  | 0 - 5% |  |  | 0 - 5%
﻿ Fixed income securities |  | 41 |  |  | 36 |  |  |  | 25 - 65% |  |  | 25 - 65%
﻿ Equity securities |  | 51 |  |  | 50 |  |  |  | 30 - 60% |  |  | 30 - 60%
﻿ Real assets |  | 5 |  |  | 5 |  |  |  | 0 - 10% |  |  | 0 - 10%
﻿ |  | 100 | % |  | 100 | % |  |  |  |  |  |
﻿

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + 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 (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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