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Stock Plans and Management Compensation (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Shares Available for Grant (in shares) | 5,100 |  |
Non-Vested Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards Vesting Period (in years) | 3 years |  |
Age of Grantee |  | 62 years |
Share-Based Compensation Expense | $ 10,900 | $ 11,100 | $ 9,700
Share-Based Compensation Expense, Tax Benefit | 2,700 | 2,800 | 3,700
Fair Value of Shares Vested During the Period | $ 19,200 | $ 4,400 | $ 12,100
Weighted Average Grant Date Fair Value | $ 53.42 | $ 54.82 |
Awarded - Weighted Average Grant Date Fair Value | 49.12 | $ 59.05 | $ 60.30
Forfeited - Weighted Average Grant Date Fair Value | 41.45 |  |
Vested - Weighted Average Grant Date Fair Value | $ 57.74 |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Outstanding at January 1 | 574 |  |
Awarded | 374 |  |
Forfeited | (183) |  |
Vested | (321) |  |
Outstanding at December 31 | 444 | 574 |
Unrecognized Compensation Cost | $ 9,100 |  |
Unrecognized Compensation Cost, Period for Recognition | 1 year 6 months |  |
Non-Vested Stock Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age of Grantee plus Grantees Total Number of Years of Service | 70 years |  |
Stock Options and SAR's [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards Vesting Period (in years) | 4 years |  |
Age of Grantee |  | 62 years |
SARs/Stock Options Outstanding [Roll Forward] |  |  |
Outstanding on January 1 | 343 | 594 | 978
Exercised | (224) | (248) | (352)
Forfeited | 0 | (3) | (32)
Outstanding on December 31 | 119 | 343 | 594
Exercisable and Vested on December 31 | 119 | 343 | 594
Weighted Average Exercise Price [Abstract] |  |  |
Outstanding on January 1 | $ 16.04 | $ 14.40 | $ 14.43
Exercised | 13.13 | 12.10 | 14.37
Forfeited | 5.86 | 17.06 | 15.76
Outstanding on December 31 | 21.57 | 16.04 | 14.40
Exercisable and Vested on December 31 | $ 21.57 | $ 16.04 | $ 14.40
Weighted Average Remaining Contractual Term [Abstract] |  |  |
Outstanding on December 31 | 1 year 4 months 24 days |  |
Exercisable and Vested on December 31 | 1 year 4 months 24 days |  |
Vested and Expected to Vest on December 31 | 1 year 4 months 24 days |  |
Aggregate Intrinsic Value [Abstract] |  |  |
Exercised | $ 10,494 | $ 12,636 | $ 16,071
Outstanding on December 31 | 4,571 | 10,439 | 24,261
Exercisable and Vested on December 31 | $ 4,571 | 10,439 | 24,261
Stock Options and SAR's [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age of Grantee plus Grantees Total Number of Years of Service | 70 years |  |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-Based Compensation Expense | $ 6,400 | 5,600 | 6,200
Share-Based Compensation Expense, Tax Benefit | 1,600 | 1,400 | 2,400
Fair Value of Shares Vested During the Period | $ 4,900 | $ 7,800 | $ 5,500
Weighted Average Grant Date Fair Value | $ 53.55 | $ 61.32 |
Awarded - Weighted Average Grant Date Fair Value | 48.92 |  |
Forfeited - Weighted Average Grant Date Fair Value | 49.30 |  |
Vested - Weighted Average Grant Date Fair Value | $ 57.49 |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Outstanding at January 1 | 91 |  |
Awarded | 137 |  |
Forfeited | (59) |  |
Vested | (81) |  |
Outstanding at December 31 | 88 | 91 |
Unrecognized Compensation Cost | $ 2,300 |  |
Unrecognized Compensation Cost, Period for Recognition | 1 year 7 months 6 days |  |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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