Minimum period following termination before vested share-based award will be delivered to recipient.

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The minimum period of service required for accelerated vesting if the employee has not yet reached the age of 65.

+ References

No definition available.

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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 does not have at least 15 years of service.

+ References

No definition available.

+ Details

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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.

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The number of equal yearly tranches over which the awards vest (on December 31 of each year after the grant date).

+ References

No definition available.

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The number of types of stock-based awards granted during the period.

+ References

No definition available.

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Percentage of share-based awards that are subject to accelerated vesting (on the later of December 31 after grant date or the date upon which they become retirement eligible).

+ References

No definition available.

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- Definition

The performance shares awarded to participants during the period as a percentage of the target based on the entity's EBITDA, determined in accordance with the grant agreement.

+ References

No definition available.

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The maximum percentage of the target amount of performance shares that may be awarded, based on the entity's EBITDA, determined in accordance with the grant agreement.

+ References

No definition available.

+ Details

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The minimum percentage of the target amount of performance shares that may be awarded, based on the entity's EBITDA, determined in accordance with the grant agreement.

+ References

No definition available.

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- Definition

The company's EBITDA exceed the performance target, thus participants earned a true-up related to their performance stock unit shares.

+ References

No definition available.

+ Details

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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

Unrecognized cost of unvested share-based compensation awards.

+ 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=6415400&loc=d3e5070-113901

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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

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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)

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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)

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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)

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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)

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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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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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.

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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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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)

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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)

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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