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Retirement Plans, Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of actuarial loss (gain) | [1] | $ 15,013 | $ (19,482) | $ 71,843
Recognition of prior service credit (cost) | [1] | (4,763) | (6,963) | (68)
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 13,402 | 14,683 | 10,645
Interest cost |  | 14,123 | 13,302 | 12,839
Expected return on plan assets |  | (16,805) | (17,921) | (18,858)
Actuarial loss (gain) |  | 5,484 | 7,728 | 701
Prior service (credit) cost |  | 0 | 0 | 0
Net periodic benefit cost |  | 16,204 | 17,792 | 5,327
Current year actuarial loss (gain) |  | 15,203 | (19,127) | 72,737
Recognition of actuarial loss (gain) |  | (5,484) | (7,728) | (701)
Recognition of prior service credit (cost) |  | 0 | 0 | 0
Total recognized in other comprehensive income |  | 9,719 | (26,855) | 72,036
Total recognized in net periodic benefit cost and other comprehensive income |  | 25,923 | (9,063) | 77,363
SERP [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0 | 0 | 0
Interest cost |  | 65 | 64 | 73
Expected return on plan assets |  | 0 | 0 | 0
Actuarial loss (gain) |  | 26 | 28 | 16
Prior service (credit) cost |  | 0 | 0 | 0
Net periodic benefit cost |  | 91 | 92 | 89
Current year actuarial loss (gain) |  | 12 | (30) | 180
Recognition of actuarial loss (gain) |  | (26) | (28) | (16)
Recognition of prior service credit (cost) |  | 0 | 0 | 0
Total recognized in other comprehensive income |  | (14) | (58) | 164
Total recognized in net periodic benefit cost and other comprehensive income |  | 77 | 34 | 253
Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0 | 0 | 0
Interest cost |  | 29 | 36 | 110
Actuarial loss (gain) |  | (747) | (793) | (649)
Prior service (credit) cost |  | 0 | 0 | 0
Net periodic benefit cost |  | (718) | (757) | (539)
Current year actuarial loss (gain) |  | (198) | (322) | (1,065)
Recognition of actuarial loss (gain) |  | 747 | 793 | 649
Recognition of prior service credit (cost) |  | 0 | 0 | 0
Adjustment for actual Medicare Part D reimbursement |  | (3) | (3) | (8)
Total recognized in other comprehensive income |  | 546 | 468 | (424)
Total recognized in net periodic benefit cost and other comprehensive income |  | $ (172) | $ (289) | $ (963)
[1] | Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 9 - Retirement Plans)

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- Definition Defined Benefit Plan, Amounts Recognized In Other Comprehensive Income (Loss) Adjustment For Actual Medicare Part D Reimbursement + References No definition available. + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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)(2) -URI http://asc.fasb.org/extlink&oid=65897934&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)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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