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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2015 stock_awards | Feb. 28, 2014 stock_awards | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) tranch $ / shares shares | Sep. 30, 2014 USD ($) shares | Dec. 31, 2014 $ / shares shares
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Number of types of stock-based awards granted (in types) | stock_awards | 2 | 2 |  |  |  |  |
Performance Shares that could be awarded, as a percentage of target amount, minimum |  |  |  |  | 0.00% |  |
Performance Shares that could be awarded, as a percentage of target amount, maximum |  |  |  |  | 200.00% |  |
Performance shares target percentage earned |  |  |  |  |  |  | 129.00%
Fair market value of awards | $ |  |  |  |  | $ 3,200 |  |
Stock-based compensation expense | $ |  |  | $ 1,432 | $ 1,876 | 4,330 | $ 4,186 |
Tax benefit from compensation expense | $ |  |  |  |  | 1,600 | 1,600 |
Unrecognized compensation expense | $ |  |  | 6,300 |  | $ 6,300 |  |
Unrecognized compensation, period for recognition |  |  |  |  | 1 year 7 months |  |
Performance Shares [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 505 | 1,152 | $ 1,719 | $ 2,202 |
Number of shares [Abstract] |  |  |  |  |  |  |
Outstanding, December 31, 2014 | shares |  |  |  |  | 116,559 |  |
Granted | shares |  |  |  |  | 116,636 | 100,692 |
Performance true-up | shares |  |  |  |  | 27,438 |  |
Vested | shares |  |  |  |  | (69,066) |  |
Forfeited | shares |  |  |  |  | (10,857) |  |
Outstanding, September 30, 2015 | shares |  |  | 180,710 |  | 180,710 |  | 116,559
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |
Outstanding, December 31, 2014 |  |  |  |  | $ 29.66 |  |
Granted |  |  |  |  | 36.17 |  |
Performance condition adjustment |  |  |  |  | 30.32 |  |
Vested |  |  |  |  | 30.25 |  |
Forfeited |  |  |  |  | 32.81 |  |
Outstanding, September 30, 2015 |  |  | $ 33.55 |  | $ 33.55 |  | $ 29.66
Performance Shares [Member] | Officers and other employees [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Number of equal tranches for annual vesting (in tranches) | tranch |  |  |  |  | 3 |  |
Performance Shares [Member] | Retirement-eligible employees [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Percentage of share-based awards that are subject to shorter vesting |  |  |  |  | 100.00% |  |
Minimum age for shorter vesting, if employee has at least 15 years of service |  |  |  |  | 62 years |  |
Eligibility for shorter vesting at age of 62, minimum period of service |  |  |  |  | 15 years |  |
Minimum age for shorter vesting, if employee does not have at least 15 years of service |  |  |  |  | 65 years |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 800 | 550 | $ 2,203 | $ 1,434 |
Number of shares [Abstract] |  |  |  |  |  |  |
Outstanding, December 31, 2014 | shares |  |  |  |  | 64,864 |  |
Granted | shares |  |  |  |  | 139,846 | 125,661 |
Vested | shares |  |  |  |  | (20,166) |  |
Forfeited | shares |  |  |  |  | (8,758) |  |
Outstanding, September 30, 2015 | shares |  |  | 175,786 |  | 175,786 |  | 64,864
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |
Outstanding, December 31, 2014 |  |  |  |  | $ 30.45 |  |
Granted |  |  |  |  | 36.18 |  |
Vested |  |  |  |  | 30.52 |  |
Forfeited |  |  |  |  | 33.97 |  |
Outstanding, September 30, 2015 |  |  | $ 34.83 |  | $ 34.83 |  | $ 30.45
Restricted Stock Units (RSUs) [Member] | Officers and other employees [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Number of equal tranches for annual vesting (in tranches) | tranch |  |  |  |  | 3 |  |
Restricted Stock Units (RSUs) [Member] | Retirement-eligible employees [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Percentage of share-based awards that are subject to shorter vesting |  |  |  |  | 100.00% |  |
Minimum age for shorter vesting, if employee has at least 15 years of service |  |  |  |  | 62 years |  |
Eligibility for shorter vesting at age of 62, minimum period of service |  |  |  |  | 15 years |  |
Minimum age for shorter vesting, if employee does not have at least 15 years of service |  |  |  |  | 65 years |  |
Restricted Stock Units (RSUs) [Member] | Nonemployee Directors [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 1 year |  |
Delivery of vested awards, minimum period following termination |  |  |  |  | 6 months |  |
Employee Stock Options [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 127 | $ 174 | $ 408 | $ 550 |

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- Definition The minimum age required for accelerated vesting (on the later of December 31 after grant date or the date upon which they become retirement eligible), if employee has at least 15 years of service. + References No definition available. + Details
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- Definition The weighted average fair value of non-vested performance true-up awards on equity-based plans excluding options 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 No definition available. + 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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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