Stock-Based Compensation (Additional Information) (Details) (USD $)	3 Months Ended
Mar. 31, 2015 offering_period	Mar. 31, 2014
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Options exercised, total intrinsic value	$ 5,700,000
Total amount of cash received from exercise of options	5,300,000
Employee Stock Purchase Plan [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Compensation expense (income)	100,000	100,000
Employee stock purchase plan, number of offering (offering period)	2
Employee stock purchase plan, offering period (months)	6 months
Employee stock purchase plan, purchase price discount (percent)	15.00%
Stock Options [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock options, contractual term (years)	10 years
Stock-based compensation, approximate forfeitures rate (percent)	3.00%
Compensation expense (income)	100,000	100,000
Performance-Based Restricted Stock [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock-based compensation, approximate forfeitures rate (percent)	7.00%
Compensation expense (income)	300,000	600,000
Restricted stock award program, measurement period (years)	3 years
Expected dividend yield (percent)	0.00%	0.00%
Restricted stock award program, payment of award as percentage of target (percent)	118.20%
Performance-Based Restricted Stock [Member] \| Minimum [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)	0.00%
Performance-Based Restricted Stock [Member] \| Maximum [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)	200.00%
Time Based Restricted Stock [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock-based compensation, approximate forfeitures rate (percent)	7.00%
Compensation expense (income)	1,100,000	900,000
Time Based Restricted Stock [Member] \| 2012 Grants [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted stock award program, vesting period (years)	3 years
Time Based Restricted Stock [Member] \| 2011 Grants [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted stock award program, vesting period (years)	4 years
Deferred Stock Units [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Compensation expense (income)	$ 0	$ 0

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Share Based Compensation Arrangement by Share Based Payment Award, Employee Stock Purchase Plan, Number of Offerings

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Employee Stock Purchase Plan, Offering Period

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Target Award, Percentage

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Expiry Period From Date Of Grant

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeitures

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- Definition

Share Based Compensation Arrangement by Share-based Payment Award, Percentage of Actual Payment of Target Amount

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Share Based Compensation Arrangement By Share Based Payment Award Performance Period

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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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.

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-Publisher FASB

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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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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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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.

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-Name Accounting Standards Codification

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