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Share-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Options [Member] |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract] |  |  |
Number of options outstanding, Ending balance (in shares) | 17,671 | 36,100 | 63,058
Options vested (in shares) | 17,671 | 27,193 | 33,573
Share-based Compensation Arrangements by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract] |  |  |
Options outstanding, weighted average exercise price, ending balance (in dollars per share) | $ 57.35 | $ 56.75 | $ 54.89
Options vested, weighted average exercise price (in dollars per share) | $ 57.35 | $ 57.08 | $ 53.09
Share-based Compensation Arrangements by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Options outstanding, aggregate intrinsic value | $ 197 | $ 1,106 | $ 1,163
Options vested, aggregate intrinsic value | 197 | 824 | 679
Options exercised, aggregate intrinsic value | $ 318 | $ 761 | $ 2,300
Weighted average remaining contractual life of options outstanding (in years) | 1 year 10 days |  |
Weighted average remaining contractual life of options vested (in years) | 1 year 10 days |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward] |  |  |
Non-vested shares awarded, beginning of period (in shares) | 427,178 | 527,607 | 667,103
Non-vested shares that were granted during the period (in shares) | 236,750 | 145,724 | 150,419
Non-vested shares that vested during period (in shares) | (225,527) | (114,201) | (242,215)
Non-vested shares that forfeited during period (in shares) | (18,167) | (131,952) | (47,700)
Non-vested shares awarded, end of period (in shares) | 420,234 | 427,178 | 527,607
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Weighted Average Grant Date Fair Value, Granted | $ 83.49 | $ 76.74 | $ 85.58
Weighted Average Grant Date Fair Value, Vested | 83.50 | 61.28 | 74.85
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share) | $ 83.10 | $ 83.69 | $ 75.68
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract] |  |  |
Share-based Compensation Expense Recognized | $ 16,000 | $ 15,100 | $ 3,600
Unrecognized compensation cost of unvested awards, for future periods | 16,300 |  |
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2021 | 10,800 |  |
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2022 | 5,400 |  |
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2023 | $ 134 |  |
Number of shares with required performance obligations | 244,392 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward] |  |  |
Non-vested shares awarded, beginning of period (in shares) | 46,689 | 0 | 0
Non-vested shares that were granted during the period (in shares) | 22,980 | 46,689 | 0
Non-vested shares that vested during period (in shares) | 0 | 0 | 0
Non-vested shares that forfeited during period (in shares) | 0 | 0 | 0
Non-vested shares awarded, end of period (in shares) | 69,669 | 46,689 | 0
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Weighted Average Grant Date Fair Value, Granted | $ 77.36 | $ 87.40 | $ 0
Weighted Average Grant Date Fair Value, Vested | 0 | 0 | 0
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share) | $ 0 | $ 0 | $ 0

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- Definition Represents the unrecognized cost of unvested share-based compensation awards to be recognized in expense in the net twelve months following the balance sheet date. + References No definition available. + Details
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- Definition Represents the unrecognized cost of unvested share-based compensation awards to be recognized in expense in year three following the balance sheet date. + References No definition available. + Details
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- Definition Represents the unrecognized cost of unvested share-based compensation awards to be recognized in expense in the second year following the balance sheet date. + References No definition available. + Details
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- Definition Number of shares with required performance obligations + References No definition available. + Details
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- Definition Compensation Expense share-based compensation, including costs that may be recognized as future expense + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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