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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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 does not have at least 15 years of service.

+ References

No definition available.

+ Details

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ Details

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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.

+ Details

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- Definition

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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- Definition

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.

+ Details

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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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- 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

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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- 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

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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.

+ 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 (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

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

-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.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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=6415400&loc=d3e5070-113901

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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

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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

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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

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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

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=6415400&loc=d3e5070-113901

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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

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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

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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.

+ 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

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Stock-Based Compensation (Details) (USD $)	1 Months Ended		3 Months Ended		12 Months Ended
Stock-Based Compensation (Details) (USD $)	Feb. 28, 2015 stock_awards	Feb. 28, 2014 stock_awards	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Stock-Based Compensation [Abstract]
Number of types of stock-based awards granted (in types)	2	2
Fair market value of awards			$ 2,900,000
Stock-based compensation expense			1,205,000us-gaap_ShareBasedCompensation	842,000us-gaap_ShareBasedCompensation
Tax benefit from compensation expense			500,000	300,000
Unrecognized compensation expense			11,000,000
Unrecognized compensation, period for recognition			1 year 10 months
Stock-Based Compensation Awards [Abstract]
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%
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense			494,000	367,000
Number of shares [Abstract]
Outstanding, December 31, 2014			116,559
Granted			116,325	100,692
Performance true-up			27,438
Vested			(64,149)
Forfeited			(1,428)
Outstanding, March 31, 2015			194,745
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2014			$ 29.66
Granted			$ 36.17
Performance condition adjustment			$ 30.32
Vested			$ 30.32
Forfeited			$ 29.79
Outstanding, March 31, 2015			$ 33.42
Performance Shares [Member] \| Officers and other employees [Member]
Stock-Based Compensation Awards [Abstract]
Number of equal tranches for annual vesting (in tranches)			3
Performance Shares [Member] \| Retirement-eligible employees [Member]
Stock-Based Compensation Awards [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			562,000	282,000
Number of shares [Abstract]
Outstanding, December 31, 2014			64,864
Granted			137,614	121,804
Vested			(17,107)
Forfeited			(1,099)
Outstanding, March 31, 2015			184,272
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2014			$ 30.45
Granted			$ 36.18
Vested			$ 30.43
Forfeited			$ 30.32
Outstanding, March 31, 2015			$ 34.73
Restricted Stock Units (RSUs) [Member] \| Officers and other employees [Member]
Stock-Based Compensation Awards [Abstract]
Number of equal tranches for annual vesting (in tranches)			3
Restricted Stock Units (RSUs) [Member] \| Retirement-eligible employees [Member]
Stock-Based Compensation Awards [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 Awards [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			$ 149,000	$ 193,000