Stock-Based Compensation (Schedule of Restricted Stock Unit Activity) (Details) (Restricted stock units [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Restricted stock units [Member]
Number of Shares
Granted and unvested, beginning of period (in shares)	1,056,597
Vested (in shares)	(335,940)
Granted (in shares)	291,500
Forfeited (in shares)	(1,560)
Total granted and unvested (in shares)	1,010,597
Approved for grant (in shares)	709,500
Total awarded and unvested, end of period (in shares)	1,720,097
Weighted Average Grant Date Fair Value
Total Granted and Unvested, beginning of period, weighted average grant date fair value (in dollars per share)	$ 26.54
Vested, weighted average grant date fair value (in dollars per share)	$ 27.64
Granted, weighted average grant date fair value (in dollars per share)	$ 23.35	$ 27.33
Forfeited, weighted average grant date fair value (in dollars per share)	$ 28.59
Total Granted and Unvested, end of period, weighted average grant date fair value (in dollars per share)	$ 27.78
Aggregate Intrinsic Value
Granted and Unvested, beginning of period, aggregate intrinsic value	$ 25,432
Vested, aggregate intrinsic value	7,323
Granted, aggregate intrinsic value	6,807
Total Granted and Unvested, aggregate intrinsic value	23,597
Approved for grant, aggregate intrinsic value	16,567
Total Awarded and Unvested, end of period, aggregate intrinsic value	$ 40,164

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that have been approved for grant but have not yet been granted for accounting purposes (i.e. a grant date fair value cannot be determined currently because the related performance targets for future years have not yet been established by the Compensation Committee).

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The aggregate intrinsic value of non-vested equity-based payment instruments, excluding stock (or unit) options, that have been approved for grant but have not yet been granted for accounting purposes (i.e. a grant date fair value cannot be determined currently because the related performance targets for future years have not yet been established by the Compensation Committee).

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The aggregate intrinsic value of non-vested equity-based payment instruments awarded, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date, including awards that have been approved for grant but have not yet been granted for accounting purposes (i.e. a grant date fair value cannot be determined currently because the related performance targets for future years have not yet been established by the Compensation Committee).

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The number of non-vested equity-based payment instruments awarded, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date, including awards that have been approved for grant but have not yet been granted for accounting purposes (i.e. a grant date fair value cannot be determined currently because the related performance targets for future years have not yet been established by the Compensation Committee).

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The aggregate intrinsic value of equity-based payment equity instruments, excluding stock or unit options, that were granted during the reporting period.

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No definition available.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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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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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)(1)(iv)(3)

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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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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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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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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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-Publisher FASB

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

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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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