Performance-based RSU performance period in years over which the vesting conditions are measured

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- Definition

Registration Statement, Amount Available for Equity or Debt Offerings

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- Definition

Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Individual Performance Factors, Percentage

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Actual Achievement Level, Percentage

+ 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

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 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

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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- 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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

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

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

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

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

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

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Equity Transactions and Stock-Based Compensation Plans (Narrative - Quarterly Disclosures) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	May. 15, 2015	Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings						$ 300.0
Registration Statement, Amount Available for Equity or Debt Offerings	$ 300.0			$ 300.0
Options Exercised, Shares	39,600	168,500		196,100	215,400
Options, Exercises in Period, Weighted Average Exercise Price	$ 3.84	$ 7.74		$ 3.84	$ 7.34
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				3 years
Expiration Period				10 years
Nonvested Options, Grants in Period, Weighted Average Grant Date Price				$ 2.31	$ 4.87
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period			3 years	1 year
Granted, Number of Award Units				47,296	32,100
Nonvested Options, Grants in Period, Weighted Average Grant Date Price				$ 7.40	$ 14.33
Time-Based RSUs [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				3 years
Granted, Number of Award Units	0	0		151,919	347,335
Performance-Based RSUs, 2015 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				39 months
Performance-based RSU performance period				3 years
Share-based Payment Award, Estimated Achievement Level, Percentage	100.00%			100.00%
Basis for Determining Award on Market Factors, Percentage				50.00%
Basis for Determining Award on Individual Performance Factors Percentage				50.00%
Performance-Based RSUs, 2014 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				39 months
Performance-based RSU performance period				3 years
Share-based Payment Award, Estimated Achievement Level, Percentage	100.00%			100.00%
Basis for Determining Award on Market Factors, Percentage				50.00%
Basis for Determining Award on Individual Performance Factors Percentage				50.00%
Performance-Based RSUs, 2011 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU performance period				3 years
Performance-Based RSUs, 2012 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				39 months
Performance-based RSU performance period				3 years
Share-based Payment Award, Actual Achievement Level, Percentage							64.00%
Basis for Determining Award on Market Factors, Percentage				30.00%
Basis for Determining Award on Individual Performance Factors Percentage				70.00%
Performance-Based RSUs, 2013 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				39 months
Performance-based RSU performance period				3 years
Share-based Payment Award, Estimated Achievement Level, Percentage	60.00%			60.00%
Basis for Determining Award on Market Factors, Percentage				30.00%
Basis for Determining Award on Individual Performance Factors Percentage				70.00%