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

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No definition available.

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

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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.

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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.

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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).

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No definition available.

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

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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).

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No definition available.

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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.

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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.

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No definition available.

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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.

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No definition available.

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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.

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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.

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No definition available.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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-SubTopic 10

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-Paragraph 2

-Subparagraph (j)

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Unrecognized cost of unvested share-based compensation awards.

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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.

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-SubTopic 10

-Section 50

-Paragraph 2

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

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-Section 50

-Paragraph 2

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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.

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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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-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

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-Paragraph 2

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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.

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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).

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-SubTopic 10

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-Paragraph 2

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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).

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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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.

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

-Publisher FASB

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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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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-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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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

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-SubTopic 10

-Section 50

-Paragraph 2

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

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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.

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

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-Paragraph 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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-Section 50

-Paragraph 2

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

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Period from grant date that an equity-based award expires, 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

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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-Name Accounting Standards Codification

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Paragraph 2

-Subparagraph (a)(3)

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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-Section 50

-Paragraph 2

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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.

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-Paragraph 2

-Subparagraph (d)(2)

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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

-Publisher FASB

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation (Details) (USD $)	1 Months Ended		12 Months Ended
Stock-Based Compensation (Details) (USD $)	Feb. 28, 2014 stock_awards	Feb. 28, 2013 stock_awards	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation [Abstract]
Maximum number of shares approved for issuance under stock-based compensation plan			3,100,000
Number of shares available for future issuance under stock-based compensation plan			2,600,000
Number of types of stock-based awards granted (in types)	2	3
Fair Market Value of Awards			$ 4,600,000
Stock-based compensation expense			5,916,000us-gaap_ShareBasedCompensation	2,869,000us-gaap_ShareBasedCompensation	0us-gaap_ShareBasedCompensation
Tax benefit from compensation expense			2,200,000	1,100,000
Unrecognized compensation expense			3,600,000
Unrecognized Compensation, Period for Recognition			1 year 6 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				112.00%
Options granted		161,257
Number of Options [Abstract]
Outstanding, December 31, 2013			161,257
Exercised			(7,850)
Cancelled/Forfeited			(12,175)
Outstanding, December 31, 2014			141,232	161,257
Vested and expected to vest, December 31, 2014			131,140
Exercisable, December 31, 2014			45,276
Weighted Average Exercise Price Per Option [Abstract]
Outstanding, December 31, 2013			$ 27.19
Exercised			$ 27.19
Cancelled/Forfeited			$ 27.19
Outstanding, December 31, 2014			$ 27.19	$ 27.19
Vested and expected to vest, December 31, 2014			$ 27.19
Exercisable, December 31, 2014			$ 27.19
Weighted Average Remaining Contractual Life [Abstract]
Weighted average remaining life (years), Outstanding, December 31, 2014			8 years 2 months
Weighted average remaining life (years), Vested and expected to vest, December 31, 2014			8 years 2 months
Weighted average remaining life (years), Exercisable, December 31, 2014			8 years 2 months
Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value (thousands), Outstanding, December 31, 2014			1,407,000
Aggregate intrinsic value (thousands), Vested and expected to vest, December 31, 2014			1,306,000
Aggregate intrinsic value (thousands), Exercisable, December 31, 2014			451,000
Intrinsic value of stock options exercised during period			100,000
Proceeds received from exercise of stock options during period			200,000
Assumptions used to calculate the fair value of stock options [Abstract]
Expected volatility				60.90%
Expected life (in years)				6 years
Risk-free interest rate				1.00%
Expected dividends				0.00%
Weighted average fair value per option granted				$ 14.87
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense			3,169,000	1,932,000
Number of shares [Abstract]
Outstanding, December 31, 2013			90,124
Granted			100,692	90,124
Performance true-up			10,767
Vested			(77,056)
Forfeited			(7,968)
Outstanding, December 31, 2014			116,559	90,124
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2013			$ 26.65
Granted			$ 30.32
Performance true-up			$ 26.65
Vested			$ 26.65
Forfeited			$ 28.93
Outstanding, December 31, 2014			$ 29.66	$ 26.65
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			2,018,000	274,000
Number of shares [Abstract]
Outstanding, December 31, 2013			14,161
Granted			128,497	14,161
Vested			(64,807)
Forfeited			(12,987)
Outstanding, December 31, 2014			64,864	14,161
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2013			$ 26.65
Granted			$ 30.41
Vested			$ 29.57
Forfeited			$ 30.32
Outstanding, December 31, 2014			$ 30.45	$ 26.65
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 Option [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense			$ 729,000	$ 663,000
Stock-Based Compensation Awards [Abstract]
Vesting period (in years)			3 years
Contractual term			10 years