Maximum Possible Payout to Executive Officer as a Percentage of the Target Award

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- Definition

Share-based Compensation Arrangement by Share-based Payment Arrangement, Performance Period

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Issued or Committed to Issue

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Four Years from Balance Sheet Date

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest One Year from Balance Sheet

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (h)(1)(i)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-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.

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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

+ References

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(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

-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)

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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.

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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 (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.

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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 (f)(2)(iv)

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- Definition

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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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Stock Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment, vesting period (years)	3 years
Weighted-average grant date fair value, Granted (in dollars per share)	$ 12.39	$ 9.33	$ 9.84
Unvested shares outstanding	514,419	583,021	676,111	1,010,127
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Expected to vest one year from balance sheet date	255,828
Expected to vest two years from balance sheet date	169,826
Expected to vest three years from balance sheet date	81,523
Expected to vest four years from balance sheet date	7,242
Unrecognized compensation cost (in dollars)	$ 3.4
Unrecognized compensation expense related to compensation awards, period for recognition (in months)	23 months
Compensation expense (in dollars)	3.2	3.4	3.3
Restricted Stock [Member] \| President and Chief Operating Officer [Member]
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Accelerated vesting expense	0.3	0.7
Market Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment, vesting period (years)	3 years
Unvested shares outstanding	98,381
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Unrecognized compensation cost (in dollars)	0.1
Unrecognized compensation expense related to compensation awards, period for recognition (in months)	2 months
Compensation expense (in dollars)	0.3	0.8	0.9
Market Stock Units [Member] \| President and Chief Operating Officer [Member]
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Accelerated vesting expense		0.2
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment, vesting period (years)	3 years
Weighted-average grant date fair value, Granted (in dollars per share)	$ 12.33	$ 9.64
Unvested shares outstanding	436,170,000	223,176,000	0
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Expected to vest two years from balance sheet date	230,592
Expected to vest three years from balance sheet date	205,578
Unrecognized compensation cost (in dollars)	2.6
Unrecognized compensation expense related to compensation awards, period for recognition (in months)	22 months
Compensation expense (in dollars)	$ 1.4	$ 0.6
Stock Incentive Plans (Textuals) [Abstract]
Performance period	3 years
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent)	150.00%
Performance Stock Units [Member] \| March 2013 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, Granted (in dollars per share)	$ 9.55
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility	39.20%
Risk-Free Rate	0.36%
Performance Stock Units [Member] \| May 2013 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, Granted (in dollars per share)	$ 10.41
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility	37.90%
Risk-Free Rate	0.40%
Performance Stock Units [Member] \| March 2014 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, Granted (in dollars per share)	$ 12.77
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility	33.50%
Risk-Free Rate	0.66%
Performance Stock Units [Member] \| May 2014 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, Granted (in dollars per share)	$ 9.88
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility	33.10%
Risk-Free Rate	0.80%
Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and Incentive plan, shares authorized	8,000,000
Number of Shares Issued or Committed to Issue	3,695,750