Aggregate Intrinsic Value [Abstract]

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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.

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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.

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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.

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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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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.

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- Definition

Weighted Average Remaining Contractual Life [Abstract]

+ References

No definition available.

+ Details

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- Definition

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.

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

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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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

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (h)(1)(i)
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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

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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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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-Paragraph 2
-Subparagraph (a)(1)
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- References

No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
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-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

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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
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-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
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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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.

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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.

+ 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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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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- 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
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-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
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-Paragraph 2
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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
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
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- References

No definition available.

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- Definition

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.

+ References

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 (f)(2)(iii)
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- Definition

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.

+ References

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 (f)(2)(ii)
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (f)(2)(iv)
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- Definition

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.

+ References

No definition available.

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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.

+ References

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- Definition

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.

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

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- Definition

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.

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

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- Definition

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.

+ References

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 (d)(2)
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- Definition

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
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (d)(1)
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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	Feb. 28, 2015 stock_awards	Feb. 28, 2014 stock_awards	Feb. 28, 2013 stock_awards $ / shares shares	Dec. 31, 2015 USD ($) tranch $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
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				2,400,000
Number of types of stock-based awards granted (in types) \| stock_awards	2	2	3
Fair Market Value of Awards \| $				$ 4,900	$ 4,600
Stock-based compensation expense \| $				5,825	5,916	$ 2,869
Tax benefit from compensation expense \| $				2,200	$ 2,200	$ 1,100
Unrecognized compensation expense \| $				$ 4,600
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					129.00%	112.00%
Options granted			161,257
Options, weighted average exercise price granted \| $ / shares			$ 27.19
Number of Options [Abstract]
Outstanding, December 31, 2014				141,232
Exercised				(8,705)
Cancelled/Forfeited				(15,245)
Outstanding, December 31, 2015				117,282	141,232
Vested and expected to vest, December 31, 2015				117,152
Exercisable, December 31, 2015				82,415
Weighted Average Exercise Price Per Option [Abstract]
Outstanding, December 31, 2014 \| $ / shares				$ 27.19
Exercised \| $ / shares				27.19
Cancelled/Forfeited \| $ / shares				27.19
Outstanding, December 31, 2015 \| $ / shares				27.19	$ 27.19
Vested and expected to vest, December 31, 2015 \| $ / shares				27.19
Exercisable, December 31, 2015 \| $ / shares				$ 27.19
Weighted Average Remaining Contractual Life [Abstract]
Weighted average remaining life (years), Outstanding, December 31, 2015				6 years 3 months
Weighted average remaining life (years), Vested and expected to vest, December 31, 2015				6 years 3 months
Weighted average remaining life (years), Exercisable, December 31, 2015				5 years 11 months
Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value (thousands), Outstanding, December 31, 2015 \| $				$ 0
Aggregate intrinsic value (thousands), Vested and expected to vest, December 31, 2015 \| $				0
Aggregate intrinsic value (thousands), Exercisable, December 31, 2015 \| $				0
Intrinsic value of stock options exercised during period \| $				100	$ 100
Proceeds received from exercise of stock options during period \| $				200	200
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 \| $ / shares						$ 14.87
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense \| $				$ 2,295	$ 3,169	$ 1,932
Number of shares [Abstract]
Outstanding, December 31, 2014				116,559
Granted				116,636	100,692	90,124
Performance condition adjustment				27,438
Vested				(112,552)
Forfeited				(13,295)
Outstanding, December 31, 2015				134,786	116,559
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2014 \| $ / shares				$ 29.66
Granted \| $ / shares				36.17	$ 30.32	$ 26.65
Performance condition adjustment \| $ / shares				30.32
Vested \| $ / shares				29.70
Forfeited \| $ / shares				32.81
Outstanding, December 31, 2015 \| $ / shares				$ 35.09	$ 29.66
Performance Shares [Member] \| Officers and other employees [Member]
Stock-Based Compensation Awards [Abstract]
Number of equal tranches for annual vesting (in tranches) \| tranch				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 \| $				$ 2,995	$ 2,018	$ 274
Number of shares [Abstract]
Outstanding, December 31, 2014				64,864
Granted				140,167	128,497	14,161
Vested				(41,026)
Forfeited				(10,662)
Outstanding, December 31, 2015				153,343	64,864
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2014 \| $ / shares				$ 30.45
Granted \| $ / shares				36.16	$ 30.41	$ 26.65
Vested \| $ / shares				30.50
Forfeited \| $ / shares				34.00
Outstanding, December 31, 2015 \| $ / shares				$ 35.41	$ 30.45
Restricted Stock Units (RSUs) [Member] \| Officers and other employees [Member]
Stock-Based Compensation Awards [Abstract]
Number of equal tranches for annual vesting (in tranches) \| tranch				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 \| $				$ 535	$ 729	$ 663
Stock-Based Compensation Awards [Abstract]
Vesting period (in years)				3 years
Contractual term				10 years