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

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

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Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding.

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

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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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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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- Definition

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

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- Definition

Stock Incentive Plans.

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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 S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification
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-SubTopic 10
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-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.

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No definition available.

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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.

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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 (a)(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).

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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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-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.

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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)
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- Definition

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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-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
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Stock Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Common stock, shares issued	200,741,777	199,964,041
February 2015 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, Granted (in dollars per share)	$ 12.13
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility	22.90%
Risk-Free Rate	1.01%
Restricted Stock
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)	$ 14.48	$ 12.39	$ 9.33
Unvested shares outstanding	474,567	514,419	583,021	676,111
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Expected to vest two years from balance sheet date	241,698
Expected to vest three years from balance sheet date	153,578
Expected to vest four years from balance sheet date	79,291
Unrecognized compensation cost (in dollars)	$ 3.7
Unrecognized compensation expense related to compensation awards, period for recognition (in months)	22 months
Compensation expense (in dollars)	$ 2.8	$ 3.2	$ 3.4
Shares vested during period	255,828	317,376	400,722
Restricted Stock \| President and Chief Operating Officer
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Accelerated vesting expense		$ 0.3	$ 0.7
Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment, vesting period (years)	3 years
Unvested shares outstanding	0
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Compensation expense (in dollars)	$ 0.1	$ 0.3	0.8
Market Stock Units \| President and Chief Operating Officer
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Accelerated vesting expense			$ 0.2
Market Stock Units \| Executive Officer
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Shares vested during period	99,047
Common stock, shares issued	148,572
Performance Stock Units
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)	$ 12.13	$ 12.33	$ 9.64
Unvested shares outstanding	676,359	436,170	223,176	0
Summary of Stock Appreciation Rights and Dividend Equivalent Rights
Expected to vest one year from balance sheet date	238,779
Expected to vest two years from balance sheet date	212,879
Expected to vest three years from balance sheet date	224,701
Unrecognized compensation cost (in dollars)	$ 3.0
Unrecognized compensation expense related to compensation awards, period for recognition (in months)	21 months
Compensation expense (in dollars)	$ 2.3	$ 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 \| March 2013 Award
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 \| May 2013 Award
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 \| March 2014 Award
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 \| May 2014 Award
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
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	3,924,735