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Stock-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Additional Disclosures [Abstract] |  |
Compensation expense, gross | $ 1,917 | $ 1,862
Performance-based Shares [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Measuring period for performance-based shares | 3 years |
Restricted Shares [Member] | Employees [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Estimated forfeitures | 5.00% |
Restricted Shares [Member] | Executives [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Estimated forfeitures | 0.00% |
Restricted Shares [Member] | Directors [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Estimated forfeitures | 0.00% |
Restricted Shares [Member] | Age 60 [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 25.00% |
Restricted Shares [Member] | Age 63 [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 25.00% |
Restricted Shares [Member] | Age 65 [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 100.00% |
Restricted and Performance-Based Shares [Member] |  |
Restricted and performance-based stock, shares [Roll Forward] |  |
Beginning of period (in shares) | 853,958 |
Granted (in shares) | 129 |
Vested (in shares) | (2,200) |
Forfeited (in shares) | (1,575) |
End of period (in shares) | 850,312 |
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward] |  |
Beginning of period (in dollars per share) | $ 33.25 |
Granted (in dollars per share) | 41.18 |
Vested (in dollars per share) | 41.71 |
Forfeited (in dollars per share) | 41.44 |
End of period (in dollars per share) | $ 33.21 |
Additional Disclosures [Abstract] |  |
Compensation expense, gross | $ 1,900 | 1,800
Compensation expense, net of tax | 1,400 | $ 1,100
Unamortized compensation expense | $ 14,700 |
Restricted and Performance-Based Shares [Member] | Employees [Member] |  |
Additional Disclosures [Abstract] |  |
Weighted average period of recognition for unrecognized compensation expense | 4 years 6 months |
Restricted and Performance-Based Shares [Member] | Directors [Member] |  |
Additional Disclosures [Abstract] |  |
Weighted average period of recognition for unrecognized compensation expense | 1 month 6 days |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Expiration of vesting period | 3 years |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Post vesting holding period for restricted and performance shares issued | 1 year |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Post vesting holding period for restricted and performance shares issued | 2 years |

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- Definition Post vesting holding period that once the award vests the participant needs to hold the award for a given time period until they can exercise the award. + References No definition available. + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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