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

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- Definition

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

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award Achieved Performance Adjustment, Number of Shares

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Additional Number of Shares Granted

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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

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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 Market Factors, Percentage

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Adjusted to Performance Condition Evaluation Number

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (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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- 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.

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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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-Name Accounting Standards Codification

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-Paragraph 2

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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.

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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).

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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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- 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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-SubTopic 10

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

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- Definition

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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- Definition

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

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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.

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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.

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-Paragraph 2

-Subparagraph (a)(2)

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- Definition

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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- Definition

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.

+ 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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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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.

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

For presentations that combine terminations, 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 or that expired.

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-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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- Definition

Weighted average price of options that were either forfeited or expired.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (d)(1)

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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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No definition available.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

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- Definition

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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- Definition

Number of options vested.

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No definition available.

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- Definition

Weighted average grant-date fair value of options vested.

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- Definition

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

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No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Price of a single share of a number of saleable stocks of a company.

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Equity Transactions and Stock-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 29, 2015	Dec. 31, 2012	May 18, 2012
Class of Stock [Line Items]
Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings	$ 300,000,000				$ 300,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,303,381
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	1,400,000
Share Price	$ 5.54us-gaap_SharePrice
Options, Outstanding, Number	4,669,776	5,532,213		5,649,991
Options, Outstanding, Weighted Average Exercise Price	$ 10.18	$ 10.18		$ 10.09
Options granted	221,440	220,656
Options, Grants in Period, Weighted Average Exercise Price	$ 8.44	$ 7.58
Options, Forfeitures	(155,100)	(67,500)
Options, Forfeitures, Weighted Average Exercise Price	$ 14.82	$ 16.02
Options Exercised, Shares	928,777	270,934
Options, Exercises in Period, Weighted Average Exercise Price	$ 9.01	$ 4.67
Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 8 months 12 days
Options, Exercisable, Number	4,124,506
Options, Exercisable, Weighted Average Exercise Price	$ 10.42
Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 2 months 12 days
Nonvested Options, Outstanding, Number	545,270	757,041		1,130,844
Nonvested Stock Options Outstanding, Weighted Average Grant Date Price	$ 4.77	$ 4.74		$ 4.89
Nonvested Options, Grants in Period, Weighted Average Grant Date Price	$ 4.87	$ 4.36
Nonvested Options, Vested in Period, Number	(433,211)	(594,459)
Nonvested Options, Vested in Period, Weighted Average Grant Date Price	$ 4.77	$ 4.88
Time-Based RSUs [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Achieved Performance Adjustment, Number of Shares	0
Performance-Based RSUs, 2011 [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Achieved Performance Adjustment, Number of Shares	22,091
Performance-Based RSUs, 2012, 2013 and 2014 [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Adjusted to Performance Condition Evaluation Number	922,845
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	5,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 1 month 6 days
Restricted Stock Units (RSUs) [Member] \| Time-Based RSUs [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Nonvested Restricted Stock Units, Number	675,079	627,712		531,526
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value	$ 8.21	$ 7.93		$ 9.16
Restricted Stock Units, Grants in Period	360,665	406,027
Restricted Stock Units, Grants in Period, Weighted Average Grant Date Fair Value	$ 8.64	$ 7.59
Restricted Stock Units, Vested in Period	(267,430)	(254,629)
Restricted Stock Units, Vested in Period, Weighted Average Grant Date Fair Value	$ 8.16	$ 9.82
Restricted Stock Units, Forfeited in Period	(45,868)	(55,212)
Restricted Stock Units, Forfeitures, Weighted Average Grant Date Fair Value	$ 8.07	$ 8.60
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs [Member]
Class of Stock [Line Items]
Nonvested Restricted Stock Units, Number	861,812	673,762		355,051
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value	$ 9.24	$ 9.19		$ 9.99
Restricted Stock Units, Grants in Period	400,503	346,731
Restricted Stock Units, Grants in Period, Weighted Average Grant Date Fair Value	$ 9.67	$ 8.34
Restricted Stock Units, Vested in Period	(155,647)	0
Restricted Stock Units, Vested in Period, Weighted Average Grant Date Fair Value	$ 10.23	$ 0.00
Restricted Stock Units, Forfeited in Period	(78,897)	(28,020)
Restricted Stock Units, Forfeitures, Weighted Average Grant Date Fair Value	$ 9.30	$ 8.81
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs, 2011 [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	39 months
Performance-based RSU performance period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage	33.33%
Share-based Compensation Arrangement by Share-based Payment Award Basis for Determining Award on Individual Performance Factors Percentage	66.67%
Share-based Compensation Arrangement by Share-based Payment Award, Actual Achievement Level, Percentage	116.60%
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs, 2012 [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	39 months
Performance-based RSU performance period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage	117.00%
Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage	33.33%
Share-based Compensation Arrangement by Share-based Payment Award Basis for Determining Award on Individual Performance Factors Percentage	66.67%
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs, 2013 [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	39 months
Performance-based RSU performance period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage	33.33%
Share-based Compensation Arrangement by Share-based Payment Award Basis for Determining Award on Individual Performance Factors Percentage	66.67%
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs, 2014 [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	39 months
Performance-based RSU performance period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage	110.00%
Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage	50.00%
Share-based Compensation Arrangement by Share-based Payment Award Basis for Determining Award on Individual Performance Factors Percentage	50.00%
Restricted Stock Units (RSUs) [Member] \| Approved Grant of Stock-based Compensation [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Additional Number of Shares Granted			581,192
Restricted Stock Units (RSUs) [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock [Member]
Class of Stock [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	0 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year			3 years
Nonvested Restricted Stock Units, Number	48,684	105,204		142,820
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value	$ 12.20	$ 8.18		$ 8.67
Restricted Stock Units, Grants in Period	32,100	61,248
Restricted Stock Units, Grants in Period, Weighted Average Grant Date Fair Value	$ 14.33	$ 7.51
Restricted Stock Units, Vested in Period	(88,620)	(98,864)
Restricted Stock Units, Vested in Period, Weighted Average Grant Date Fair Value	$ 8.20	$ 8.47
Restricted Stock [Member] \| Maximum [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,669,117
Stock Options [Member]
Class of Stock [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	0 years 7 months 6 days
Nonvested Options, Grants in Period, Weighted Average Grant Date Price	$ 4.87	$ 4.36		$ 5.02
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Stock Options [Member] \| Approved Grant of Stock-based Compensation [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Additional Number of Shares Granted			338,638
Stock Options [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years