Stock-Based Compensation (Details 2) - Restricted stock units - shares	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Restricted stock units
Restricted stock units at the beginning of the period (in shares)	368,084	539,106
Shares awarded	170,994	131,597
Shares vested	(231,969)	(298,791)
Shares forfeited	(11,082)	(3,828)
Restricted stock units at the end of the period (in shares)	296,027	368,084
Outstanding restricted shares vesting schedule
Outstanding restricted stock unit awards, vesting in 2015 (in shares)	17,526
Outstanding restricted stock unit awards, vesting in 2016 (in shares)	133,677
Outstanding restricted stock unit awards, vesting in 2017 (in shares)	91,287
Outstanding restricted stock unit awards, vesting in 2018 (in shares)	53,537

No definition available.

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the year following the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the third year following the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the second year following the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

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

+ 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)(1)(iv)(3)

-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

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.

+ 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)(i)-(ii)

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

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

+ 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)(2)

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

+ Details

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