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Retirement Benefit Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total recognized in other comprehensive income |  | $ 45,198 | $ 10,929 | $ 12,748
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 12,414 | 15,381 | 14,098
Interest cost |  | 16,762 | 16,514 | 16,907
Expected return on plan assets |  | (41,033) | (37,632) | (34,554)
Amortization of net loss/ prior service cost |  | 5,423 | 5,554 | 5,783
Net periodic benefit cost |  | (6,434) | (183) | 2,234
Net (loss) gain recognized during the year |  | (5,423) | (5,554) | (5,783)
Net actuarial loss (gain) |  | 51,915 | (7,378) | 12,128
Total recognized in other comprehensive income |  | 46,492 | (12,932) | 6,345
Total recognized in net periodic benefit cost and other comprehensive income |  | $ 40,058 | $ (13,115) | $ 8,579
Discount rate for benefit obligations |  | 4.14% | 3.57% | 4.10%
Discount rate for net periodic benefit cost |  | 3.57% | 4.10% | 4.40%
Expected long-term return on plan assets |  | 7.25% | 7.25% | 7.25%
Rate of compensation increase | [1] |  |  |
Pension Benefits [Member] | Graded Scale, At Age 20 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Rate of compensation increase |  | 7.00% | 7.00% | 7.00%
Pension Benefits [Member] | Graded Scale, At Age 60 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Rate of compensation increase |  | 2.00% | 2.00% | 2.00%
Other Post-Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | $ 120 | $ 129 | $ 170
Interest cost |  | 621 | 668 | 773
Amortization of net loss/ prior service cost |  | (434) | (353) | 145
Net periodic benefit cost |  | 307 | 444 | 1,088
Net (loss) gain recognized during the year |  | 434 | 353 | (145)
Net actuarial loss (gain) |  | (6,717) | 993 | 620
Total recognized in other comprehensive income |  | (6,283) | 1,346 | 475
Total recognized in net periodic benefit cost and other comprehensive income |  | $ (5,976) | $ 1,790 | $ 1,563
Discount rate for benefit obligations |  | 4.10% | 3.52% | 3.95%
Discount rate for net periodic benefit cost |  | 3.52% | 3.95% | 4.32%
[1] | Graded scale, declining from 7.00% at age 20 to 2.00% at age 60

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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